21010534252 has 6 divisors (see below), whose sum is σ = 36768434948. Its totient is φ = 10505267124.

The previous prime is 21010534219. The next prime is 21010534271. The reversal of 21010534252 is 25243501012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626316778 + ... + 2626316785.

Almost surely, 2^21010534252 is an apocalyptic number.

It is an amenable number.

21010534252 is a deficient number, since it is larger than the sum of its proper divisors (15757900696).

21010534252 is a wasteful number, since it uses less digits than its factorization.

21010534252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252633567 (or 5252633565 counting only the distinct ones).

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

The spelling of 21010534252 in words is "twenty-one billion, ten million, five hundred thirty-four thousand, two hundred fifty-two".