1012312221 has 8 divisors (see below), whose sum is σ = 1351392960. Its totient is φ = 674053152.

The previous prime is 1012312207. The next prime is 1012312237. The reversal of 1012312221 is 1222132101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1012312221 - 2¹⁵ = 1012279453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1012312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012312201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202536 + ... + 207473.

It is an arithmetic number, because the mean of its divisors is an integer number (168924120).

Almost surely, 2^1012312221 is an apocalyptic number.

It is an amenable number.

1012312221 is a deficient number, since it is larger than the sum of its proper divisors (339080739).

1012312221 is an equidigital number, since it uses as much as digits as its factorization.

1012312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410835.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1012312221 is about 31816.8543542570. The cubic root of 1012312221 is about 1004.0873445199.

Adding to 1012312221 its reverse (1222132101), we get a palindrome (2234444322).

The spelling of 1012312221 in words is "one billion, twelve million, three hundred twelve thousand, two hundred twenty-one".