21110533252 has 12 divisors (see below), whose sum is σ = 36945199116. Its totient is φ = 10554762080.

The previous prime is 21110533237. The next prime is 21110533271. The reversal of 21110533252 is 25233501112.

It can be written as a sum of positive squares in 2 ways, for example, as 8980594756 + 12129938496 = 94766^2 + 110136^2 .

It is a super-2 number, since 2×21110533252² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22543 + ... + 206710.

It is an arithmetic number, because the mean of its divisors is an integer number (3078766593).

Almost surely, 2^21110533252 is an apocalyptic number.

It is an amenable number.

21110533252 is a deficient number, since it is larger than the sum of its proper divisors (15834665864).

21110533252 is a wasteful number, since it uses less digits than its factorization.

21110533252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252278 (or 252276 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 21110533252 in words is "twenty-one billion, one hundred ten million, five hundred thirty-three thousand, two hundred fifty-two".