21121031030 has 64 divisors (see below), whose sum is σ = 43944353280. Its totient is φ = 7223539200.

The previous prime is 21121030993. The next prime is 21121031039. The reversal of 21121031030 is 3013012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121030996 and 21121031014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121031039) 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, 3510725 + ... + 3516735.

It is an arithmetic number, because the mean of its divisors is an integer number (686630520).

Almost surely, 2^21121031030 is an apocalyptic number.

21121031030 is an abundant number, since it is smaller than the sum of its proper divisors (22823322250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121031030 is a wasteful number, since it uses less digits than its factorization.

21121031030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7925.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21121031030 its reverse (3013012112), we get a palindrome (24134043142).

The spelling of 21121031030 in words is "twenty-one billion, one hundred twenty-one million, thirty-one thousand, thirty".