21541031052 has 24 divisors (see below), whose sum is σ = 50266403376. Its totient is φ = 7179772608.

The previous prime is 21541031047. The next prime is 21541031053. The reversal of 21541031052 is 25013014512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21541031053) 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, 102778 + ... + 231614.

It is an arithmetic number, because the mean of its divisors is an integer number (2094433474).

Almost surely, 2^21541031052 is an apocalyptic number.

It is an amenable number.

21541031052 is an abundant number, since it is smaller than the sum of its proper divisors (28725372324).

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

21541031052 is a wasteful number, since it uses less digits than its factorization.

21541031052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142777 (or 142775 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21541031052 its reverse (25013014512), we get a palindrome (46554045564).

The spelling of 21541031052 in words is "twenty-one billion, five hundred forty-one million, thirty-one thousand, fifty-two".