21025034120 has 32 divisors (see below), whose sum is σ = 47312196120. Its totient is φ = 8408970240.

The previous prime is 21025034099. The next prime is 21025034123. The reversal of 21025034120 is 2143052012.

It can be written as a sum of positive squares in 4 ways, for example, as 9982807396 + 11042226724 = 99914^2 + 105082^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21025034092 and 21025034101.

It is not an unprimeable number, because it can be changed into a prime (21025034123) 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, 348944 + ... + 404736.

Almost surely, 2^21025034120 is an apocalyptic number.

21025034120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21025034120 is an abundant number, since it is smaller than the sum of its proper divisors (26287162000).

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

21025034120 is a wasteful number, since it uses less digits than its factorization.

21025034120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65225 (or 65221 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21025034120 its reverse (2143052012), we get a palindrome (23168086132).

The spelling of 21025034120 in words is "twenty-one billion, twenty-five million, thirty-four thousand, one hundred twenty".