216887021701 has 24 divisors (see below), whose sum is σ = 260769801600. Its totient is φ = 179755474752.

The previous prime is 216887021671. The next prime is 216887021723. The reversal of 216887021701 is 107120788612.

It is not a de Polignac number, because 216887021701 - 2⁹ = 216887021189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216887021731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 376176 + ... + 758473.

It is an arithmetic number, because the mean of its divisors is an integer number (10865408400).

Almost surely, 2^216887021701 is an apocalyptic number.

It is an amenable number.

216887021701 is a deficient number, since it is larger than the sum of its proper divisors (43882779899).

216887021701 is a wasteful number, since it uses less digits than its factorization.

216887021701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134793 (or 1134786 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 216887021701 in words is "two hundred sixteen billion, eight hundred eighty-seven million, twenty-one thousand, seven hundred one".