216931403451 has 12 divisors (see below), whose sum is σ = 336465034152. Its totient is φ = 123960801888.

The previous prime is 216931403443. The next prime is 216931403459. The reversal of 216931403451 is 154304139612.

It is an interprime number because it is at equal distance from previous prime (216931403443) and next prime (216931403459).

It is not a de Polignac number, because 216931403451 - 2³ = 216931403443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216931403459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 737861770 + ... + 737862063.

It is an arithmetic number, because the mean of its divisors is an integer number (28038752846).

Almost surely, 2^216931403451 is an apocalyptic number.

216931403451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

216931403451 is a deficient number, since it is larger than the sum of its proper divisors (119533630701).

216931403451 is a wasteful number, since it uses less digits than its factorization.

216931403451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475723850 (or 1475723843 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 216931403451 in words is "two hundred sixteen billion, nine hundred thirty-one million, four hundred three thousand, four hundred fifty-one".