21507527006252 has 24 divisors (see below), whose sum is σ = 43167050685696. Its totient is φ = 9184940858448.

The previous prime is 21507527006233. The next prime is 21507527006309. The reversal of 21507527006252 is 25260072570512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1357105088 + ... + 1357120935.

It is an arithmetic number, because the mean of its divisors is an integer number (1798627111904).

Almost surely, 2^{21507527006252} is an apocalyptic number.

It is an amenable number.

21507527006252 is an abundant number, since it is smaller than the sum of its proper divisors (21659523679444).

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

21507527006252 is a wasteful number, since it uses less digits than its factorization.

21507527006252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714226317 (or 2714226315 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 44.

Adding to 21507527006252 its reverse (25260072570512), we get a palindrome (46767599576764).

The spelling of 21507527006252 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-seven million, six thousand, two hundred fifty-two".