21145015134 has 48 divisors (see below), whose sum is σ = 46953658752. Its totient is φ = 6873555024.

The previous prime is 21145015117. The next prime is 21145015141. The reversal of 21145015134 is 43151054112.

21145015134 is a `hidden beast` number, since 2 + 1 + 145 + 0 + 1 + 513 + 4 = 666.

It is a super-2 number, since 2×21145015134² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21145015098 and 21145015107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 476439 + ... + 518925.

It is an arithmetic number, because the mean of its divisors is an integer number (978201224).

Almost surely, 2^21145015134 is an apocalyptic number.

21145015134 is an abundant number, since it is smaller than the sum of its proper divisors (25808643618).

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

21145015134 is a wasteful number, since it uses less digits than its factorization.

21145015134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43181 (or 43178 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 21145015134 its reverse (43151054112), we get a palindrome (64296069246).

The spelling of 21145015134 in words is "twenty-one billion, one hundred forty-five million, fifteen thousand, one hundred thirty-four".