21236357046 has 32 divisors (see below), whose sum is σ = 44766315360. Its totient is φ = 6705730304.

The previous prime is 21236356997. The next prime is 21236357059. The reversal of 21236357046 is 64075363212.

It is a super-2 number, since 2×21236357046² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21236356995 and 21236357013.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1142175 + ... + 1160618.

It is an arithmetic number, because the mean of its divisors is an integer number (1398947355).

Almost surely, 2^21236357046 is an apocalyptic number.

21236357046 is an abundant number, since it is smaller than the sum of its proper divisors (23529958314).

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

21236357046 is a wasteful number, since it uses less digits than its factorization.

21236357046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302880.

The product of its (nonzero) digits is 181440, while the sum is 39.

The spelling of 21236357046 in words is "twenty-one billion, two hundred thirty-six million, three hundred fifty-seven thousand, forty-six".