216261344994 has 64 divisors (see below), whose sum is σ = 445543386624. Its totient is φ = 69957513216.

The previous prime is 216261344993. The next prime is 216261345037. The reversal of 216261344994 is 499443162612.

It is a happy number.

It is a super-2 number, since 2×216261344994² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216261344993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7335367 + ... + 7364789.

It is an arithmetic number, because the mean of its divisors is an integer number (6961615416).

Almost surely, 2^216261344994 is an apocalyptic number.

216261344994 is an abundant number, since it is smaller than the sum of its proper divisors (229282041630).

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

216261344994 is a wasteful number, since it uses less digits than its factorization.

216261344994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29771.

The product of its digits is 2239488, while the sum is 51.

The spelling of 216261344994 in words is "two hundred sixteen billion, two hundred sixty-one million, three hundred forty-four thousand, nine hundred ninety-four".