21919537332 has 120 divisors (see below), whose sum is σ = 71441536320. Its totient is φ = 5693379840.

The previous prime is 21919537331. The next prime is 21919537411. The reversal of 21919537332 is 23373591912.

21919537332 is a `hidden beast` number, since 2 + 191 + 95 + 373 + 3 + 2 = 666.

It is a super-2 number, since 2×21919537332² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919537331) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 414357 + ... + 464252.

It is an arithmetic number, because the mean of its divisors is an integer number (595346136).

Almost surely, 2^21919537332 is an apocalyptic number.

21919537332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21919537332 is an abundant number, since it is smaller than the sum of its proper divisors (49521998988).

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

21919537332 is a wasteful number, since it uses less digits than its factorization.

21919537332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878643 (or 878632 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The spelling of 21919537332 in words is "twenty-one billion, nine hundred nineteen million, five hundred thirty-seven thousand, three hundred thirty-two".