210318473921 has 2 divisors, whose sum is σ = 210318473922. Its totient is φ = 210318473920.

The previous prime is 210318473887. The next prime is 210318473941. The reversal of 210318473921 is 129374813012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204268745521 + 6049728400 = 451961^2 + 77780^2 .

It is a cyclic number.

It is not a de Polignac number, because 210318473921 - 2²⁶ = 210251365057 is a prime.

It is a super-2 number, since 2×210318473921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210318473941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105159236960 + 105159236961.

It is an arithmetic number, because the mean of its divisors is an integer number (105159236961).

Almost surely, 2^210318473921 is an apocalyptic number.

It is an amenable number.

210318473921 is a deficient number, since it is larger than the sum of its proper divisors (1).

210318473921 is an equidigital number, since it uses as much as digits as its factorization.

210318473921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 210318473921 in words is "two hundred ten billion, three hundred eighteen million, four hundred seventy-three thousand, nine hundred twenty-one".