21151043052 has 48 divisors (see below), whose sum is σ = 50889565440. Its totient is φ = 6833963968.

The previous prime is 21151043047. The next prime is 21151043093. The reversal of 21151043052 is 25034015112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147552 + ... + 253127.

It is an arithmetic number, because the mean of its divisors is an integer number (1060199280).

Almost surely, 2^21151043052 is an apocalyptic number.

It is an amenable number.

21151043052 is an abundant number, since it is smaller than the sum of its proper divisors (29738522388).

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

21151043052 is a wasteful number, since it uses less digits than its factorization.

21151043052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400822 (or 400820 counting only the distinct ones).

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

Adding to 21151043052 its reverse (25034015112), we get a palindrome (46185058164).

The spelling of 21151043052 in words is "twenty-one billion, one hundred fifty-one million, forty-three thousand, fifty-two".