21021031330120 has 16 divisors (see below), whose sum is σ = 47297320492860. Its totient is φ = 8408412532032.

The previous prime is 21021031330073. The next prime is 21021031330139. The reversal of 21021031330120 is 2103313012012.

It can be written as a sum of positive squares in 2 ways, for example, as 17169570129924 + 3851461200196 = 4143618^2 + 1962514^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262762891587 + ... + 262762891666.

Almost surely, 2^{21021031330120} is an apocalyptic number.

21021031330120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021031330120 is an abundant number, since it is smaller than the sum of its proper divisors (26276289162740).

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

21021031330120 is a wasteful number, since it uses less digits than its factorization.

21021031330120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525525783264 (or 525525783260 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21021031330120 its reverse (2103313012012), we get a palindrome (23124344342132).

The spelling of 21021031330120 in words is "twenty-one trillion, twenty-one billion, thirty-one million, three hundred thirty thousand, one hundred twenty".