21542132331 has 40 divisors (see below), whose sum is σ = 32884158384. Its totient is φ = 14048873280.

The previous prime is 21542132251. The next prime is 21542132357. The reversal of 21542132331 is 13323124512.

21542132331 is a `hidden beast` number, since 2 + 1 + 5 + 421 + 3 + 233 + 1 = 666.

It is not a de Polignac number, because 21542132331 - 2¹⁰ = 21542131307 is a prime.

It is a super-2 number, since 2×21542132331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21542132295 and 21542132304.

It is not an unprimeable number, because it can be changed into a prime (21542132831) 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, 1482441 + ... + 1496901.

Almost surely, 2^21542132331 is an apocalyptic number.

21542132331 is a deficient number, since it is larger than the sum of its proper divisors (11342026053).

21542132331 is a wasteful number, since it uses less digits than its factorization.

21542132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14873 (or 14864 counting only the distinct ones).

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

Adding to 21542132331 its reverse (13323124512), we get a palindrome (34865256843).

The spelling of 21542132331 in words is "twenty-one billion, five hundred forty-two million, one hundred thirty-two thousand, three hundred thirty-one".