21451511524450 has 48 divisors (see below), whose sum is σ = 45639402891264. Its totient is φ = 7348413888000.

The previous prime is 21451511524397. The next prime is 21451511524453. The reversal of 21451511524450 is 5442511515412.

It is a super-2 number, since 2×21451511524450² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21451511524453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26221839 + ... + 27027538.

It is an arithmetic number, because the mean of its divisors is an integer number (950820893568).

Almost surely, 2^{21451511524450} is an apocalyptic number.

21451511524450 is an abundant number, since it is smaller than the sum of its proper divisors (24187891366814).

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

21451511524450 is a wasteful number, since it uses less digits than its factorization.

21451511524450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53250547 (or 53250542 counting only the distinct ones).

The product of its (nonzero) digits is 160000, while the sum is 40.

The spelling of 21451511524450 in words is "twenty-one trillion, four hundred fifty-one billion, five hundred eleven million, five hundred twenty-four thousand, four hundred fifty".