21240531052 has 48 divisors (see below), whose sum is σ = 40723845120. Its totient is φ = 9634911552.

The previous prime is 21240531049. The next prime is 21240531089. The reversal of 21240531052 is 25013504212.

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, 691599 + ... + 721657.

It is an arithmetic number, because the mean of its divisors is an integer number (848413440).

Almost surely, 2^21240531052 is an apocalyptic number.

It is an amenable number.

21240531052 is a deficient number, since it is larger than the sum of its proper divisors (19483314068).

21240531052 is a wasteful number, since it uses less digits than its factorization.

21240531052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30310 (or 30308 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21240531052 in words is "twenty-one billion, two hundred forty million, five hundred thirty-one thousand, fifty-two".