21126360042 has 12 divisors (see below), whose sum is σ = 45773780130. Its totient is φ = 7042120008.

The previous prime is 21126360023. The next prime is 21126360043. The reversal of 21126360042 is 24006362112.

21126360042 is a `hidden beast` number, since 2 + 1 + 12 + 6 + 3 + 600 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17074910241 + 4051449801 = 130671^2 + 63651^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21126359988 and 21126360015.

It is not an unprimeable number, because it can be changed into a prime (21126360043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586843317 + ... + 586843352.

Almost surely, 2^21126360042 is an apocalyptic number.

21126360042 is an abundant number, since it is smaller than the sum of its proper divisors (24647420088).

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

21126360042 is a wasteful number, since it uses less digits than its factorization.

21126360042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173686677 (or 1173686674 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 21126360042 in words is "twenty-one billion, one hundred twenty-six million, three hundred sixty thousand, forty-two".