1031420221 has 4 divisors (see below), whose sum is σ = 1110760252. Its totient is φ = 952080192.

The previous prime is 1031420219. The next prime is 1031420233. The reversal of 1031420221 is 1220241301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 638825625 + 392594596 = 25275^2 + 19814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031420221 - 2¹ = 1031420219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031420195 and 1031420204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031420261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39669996 + ... + 39670021.

It is an arithmetic number, because the mean of its divisors is an integer number (277690063).

Almost surely, 2^1031420221 is an apocalyptic number.

It is an amenable number.

1031420221 is a deficient number, since it is larger than the sum of its proper divisors (79340031).

1031420221 is an equidigital number, since it uses as much as digits as its factorization.

1031420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79340030.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1031420221 is about 32115.7316746793. The cubic root of 1031420221 is about 1010.3655902927.

Adding to 1031420221 its reverse (1220241301), we get a palindrome (2251661522).

The spelling of 1031420221 in words is "one billion, thirty-one million, four hundred twenty thousand, two hundred twenty-one".