221151694990 has 32 divisors (see below), whose sum is σ = 398660266080. Its totient is φ = 88330289664.

The previous prime is 221151694919. The next prime is 221151694991. The reversal of 221151694990 is 99496151122.

It is a happy number.

It is a super-2 number, since 2×221151694990² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221151694991) 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, 22268346 + ... + 22278274.

It is an arithmetic number, because the mean of its divisors is an integer number (12458133315).

Almost surely, 2^221151694990 is an apocalyptic number.

221151694990 is a deficient number, since it is larger than the sum of its proper divisors (177508571090).

221151694990 is a wasteful number, since it uses less digits than its factorization.

221151694990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12996.

The product of its (nonzero) digits is 349920, while the sum is 49.

The spelling of 221151694990 in words is "two hundred twenty-one billion, one hundred fifty-one million, six hundred ninety-four thousand, nine hundred ninety".