21513524134542 has 16 divisors (see below), whose sum is σ = 46938598111872. Its totient is φ = 6519249737720.

The previous prime is 21513524134523. The next prime is 21513524134549. The reversal of 21513524134542 is 24543142531512.

It is a super-2 number, since 2×21513524134542² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21513524134494 and 21513524134503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513524134549) 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, 162981243378 + ... + 162981243509.

It is an arithmetic number, because the mean of its divisors is an integer number (2933662381992).

Almost surely, 2^{21513524134542} is an apocalyptic number.

21513524134542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21513524134542 is an abundant number, since it is smaller than the sum of its proper divisors (25425073977330).

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

21513524134542 is a wasteful number, since it uses less digits than its factorization.

21513524134542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325962486903.

The product of its digits is 576000, while the sum is 42.

The spelling of 21513524134542 in words is "twenty-one trillion, five hundred thirteen billion, five hundred twenty-four million, one hundred thirty-four thousand, five hundred forty-two".