21042040332 has 12 divisors (see below), whose sum is σ = 49098094136. Its totient is φ = 7014013440.

The previous prime is 21042040297. The next prime is 21042040361. The reversal of 21042040332 is 23304024012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21042040332² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21042040299 and 21042040308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876751669 + ... + 876751692.

Almost surely, 2^21042040332 is an apocalyptic number.

It is an amenable number.

21042040332 is an abundant number, since it is smaller than the sum of its proper divisors (28056053804).

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

21042040332 is a wasteful number, since it uses less digits than its factorization.

21042040332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753503368 (or 1753503366 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21042040332 its reverse (23304024012), we get a palindrome (44346064344).

The spelling of 21042040332 in words is "twenty-one billion, forty-two million, forty thousand, three hundred thirty-two".