252012540021 has 16 divisors (see below), whose sum is σ = 369023860800. Its totient is φ = 151709803520.

The previous prime is 252012540019. The next prime is 252012540061. The reversal of 252012540021 is 120045210252.

It is not a de Polignac number, because 252012540021 - 2¹ = 252012540019 is a prime.

It is a super-2 number, since 2×252012540021² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 252012539973 and 252012540000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252012540001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25621740 + ... + 25631573.

It is an arithmetic number, because the mean of its divisors is an integer number (23063991300).

Almost surely, 2^252012540021 is an apocalyptic number.

It is an amenable number.

252012540021 is a deficient number, since it is larger than the sum of its proper divisors (117011320779).

252012540021 is a wasteful number, since it uses less digits than its factorization.

252012540021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51253476.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 252012540021 its reverse (120045210252), we get a palindrome (372057750273).

The spelling of 252012540021 in words is "two hundred fifty-two billion, twelve million, five hundred forty thousand, twenty-one".