21231541332 has 36 divisors (see below), whose sum is σ = 56825597556. Its totient is φ = 6660875520.

The previous prime is 21231541327. The next prime is 21231541333. The reversal of 21231541332 is 23314513212.

21231541332 is a `hidden beast` number, since 2 + 12 + 315 + 4 + 1 + 332 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5866947216 + 15364594116 = 76596^2 + 123954^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21231541296 and 21231541305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231541333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17345419 + ... + 17346642.

It is an arithmetic number, because the mean of its divisors is an integer number (1578488821).

Almost surely, 2^21231541332 is an apocalyptic number.

It is an amenable number.

21231541332 is an abundant number, since it is smaller than the sum of its proper divisors (35594056224).

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

21231541332 is a wasteful number, since it uses less digits than its factorization.

21231541332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34692088 (or 34692083 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The spelling of 21231541332 in words is "twenty-one billion, two hundred thirty-one million, five hundred forty-one thousand, three hundred thirty-two".