210917681968 has 80 divisors (see below), whose sum is σ = 476094599424. Its totient is φ = 88651157760.

The previous prime is 210917681941. The next prime is 210917681969. The reversal of 210917681968 is 869186719012.

It is not an unprimeable number, because it can be changed into a prime (210917681969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1641498 + ... + 1765318.

Almost surely, 2^210917681968 is an apocalyptic number.

210917681968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210917681968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238047299712).

210917681968 is an abundant number, since it is smaller than the sum of its proper divisors (265176917456).

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

210917681968 is a wasteful number, since it uses less digits than its factorization.

210917681968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124130 (or 124124 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 58.

The spelling of 210917681968 in words is "two hundred ten billion, nine hundred seventeen million, six hundred eighty-one thousand, nine hundred sixty-eight".