1220130021 has 32 divisors (see below), whose sum is σ = 1850572800. Its totient is φ = 708281280.

The previous prime is 1220130017. The next prime is 1220130061. The reversal of 1220130021 is 1200310221.

It is not a de Polignac number, because 1220130021 - 2² = 1220130017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220129979 and 1220130006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220130061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116520 + ... + 126558.

It is an arithmetic number, because the mean of its divisors is an integer number (57830400).

Almost surely, 2^1220130021 is an apocalyptic number.

1220130021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220130021 is a deficient number, since it is larger than the sum of its proper divisors (630442779).

1220130021 is a wasteful number, since it uses less digits than its factorization.

1220130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1220130021 is about 34930.3595887589. The cubic root of 1220130021 is about 1068.5676881731.

Adding to 1220130021 its reverse (1200310221), we get a palindrome (2420440242).

The spelling of 1220130021 in words is "one billion, two hundred twenty million, one hundred thirty thousand, twenty-one".