20521531353112 has 32 divisors (see below), whose sum is σ = 38619741675600. Its totient is φ = 10222944666624.

The previous prime is 20521531353109. The next prime is 20521531353137. The reversal of 20521531353112 is 21135313512502.

It is a super-2 number, since 2×20521531353112² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14182288 + ... + 15562144.

Almost surely, 2^{20521531353112} is an apocalyptic number.

It is an amenable number.

20521531353112 is a deficient number, since it is larger than the sum of its proper divisors (18098210322488).

20521531353112 is a wasteful number, since it uses less digits than its factorization.

20521531353112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386715 (or 1386711 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

Adding to 20521531353112 its reverse (21135313512502), we get a palindrome (41656844865614).

The spelling of 20521531353112 in words is "twenty trillion, five hundred twenty-one billion, five hundred thirty-one million, three hundred fifty-three thousand, one hundred twelve".