21237043026 has 16 divisors (see below), whose sum is σ = 42530203584. Its totient is φ = 7069661424.

The previous prime is 21237043001. The next prime is 21237043027. The reversal of 21237043026 is 62034073212.

It is a junction number, because it is equal to n+sod(n) for n = 21237042984 and 21237043002.

It is not an unprimeable number, because it can be changed into a prime (21237043027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2333310 + ... + 2342393.

It is an arithmetic number, because the mean of its divisors is an integer number (2658137724).

Almost surely, 2^21237043026 is an apocalyptic number.

21237043026 is an abundant number, since it is smaller than the sum of its proper divisors (21293160558).

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

21237043026 is a wasteful number, since it uses less digits than its factorization.

21237043026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4676465.

The product of its (nonzero) digits is 12096, while the sum is 30.

The spelling of 21237043026 in words is "twenty-one billion, two hundred thirty-seven million, forty-three thousand, twenty-six".