21820253290746 has 16 divisors (see below), whose sum is σ = 43641660112704. Its totient is φ = 7273225508384.

The previous prime is 21820253290673. The next prime is 21820253290783. The reversal of 21820253290746 is 64709235202812.

It is a super-2 number, since 2×21820253290746² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47817795 + ... + 48271958.

It is an arithmetic number, because the mean of its divisors is an integer number (2727603757044).

It is a 1-persistent number, because it is pandigital, but 2⋅21820253290746 = 43640506581492 is not.

Almost surely, 2^{21820253290746} is an apocalyptic number.

21820253290746 is an abundant number, since it is smaller than the sum of its proper divisors (21821406821958).

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

21820253290746 is a wasteful number, since it uses less digits than its factorization.

21820253290746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96127605.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 21820253290746 in words is "twenty-one trillion, eight hundred twenty billion, two hundred fifty-three million, two hundred ninety thousand, seven hundred forty-six".