21132844542 has 32 divisors (see below), whose sum is σ = 46966644000. Its totient is φ = 7043566464.

The previous prime is 21132844541. The next prime is 21132844547. The reversal of 21132844542 is 24544823112.

21132844542 is a `hidden beast` number, since 2 + 1 + 1 + 32 + 84 + 4 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21132844497 and 21132844506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132844541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965334 + ... + 986982.

It is an arithmetic number, because the mean of its divisors is an integer number (1467707625).

Almost surely, 2^21132844542 is an apocalyptic number.

21132844542 is an abundant number, since it is smaller than the sum of its proper divisors (25833799458).

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

21132844542 is a wasteful number, since it uses less digits than its factorization.

21132844542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39737 (or 39731 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

The spelling of 21132844542 in words is "twenty-one billion, one hundred thirty-two million, eight hundred forty-four thousand, five hundred forty-two".