21513455210045 has 32 divisors (see below), whose sum is σ = 26744745542400. Its totient is φ = 16593420501504.

The previous prime is 21513455210033. The next prime is 21513455210047. The reversal of 21513455210045 is 54001255431512.

It is a cyclic number.

It is not a de Polignac number, because 21513455210045 - 2⁴ = 21513455210029 is a prime.

It is a super-2 number, since 2×21513455210045² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21513455209990 and 21513455210008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513455210047) 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, 305931809 + ... + 306002121.

It is an arithmetic number, because the mean of its divisors is an integer number (835773298200).

Almost surely, 2^{21513455210045} is an apocalyptic number.

It is an amenable number.

21513455210045 is a deficient number, since it is larger than the sum of its proper divisors (5231290332355).

21513455210045 is a wasteful number, since it uses less digits than its factorization.

21513455210045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73349.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 21513455210045 in words is "twenty-one trillion, five hundred thirteen billion, four hundred fifty-five million, two hundred ten thousand, forty-five".