21132070652 has 54 divisors (see below), whose sum is σ = 47285244216. Its totient is φ = 8233265040.

The previous prime is 21132070649. The next prime is 21132070699. The reversal of 21132070652 is 25607023112.

It is a happy number.

It is a super-2 number, since 2×21132070652² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 421808 + ... + 469239.

Almost surely, 2^21132070652 is an apocalyptic number.

21132070652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21132070652 is an abundant number, since it is smaller than the sum of its proper divisors (26153173564).

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

21132070652 is a wasteful number, since it uses less digits than its factorization.

21132070652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891087 (or 891067 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 21132070652 its reverse (25607023112), we get a palindrome (46739093764).

The spelling of 21132070652 in words is "twenty-one billion, one hundred thirty-two million, seventy thousand, six hundred fifty-two".