221622155551 has 8 divisors (see below), whose sum is σ = 225284241600. Its totient is φ = 217961003040.

The previous prime is 221622155537. The next prime is 221622155567. The reversal of 221622155551 is 155551226122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221622155551 - 2¹⁵ = 221622122783 is a prime.

It is a super-2 number, since 2×221622155551² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221622155551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221622155501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253665 + ... + 712453.

It is an arithmetic number, because the mean of its divisors is an integer number (28160530200).

Almost surely, 2^221622155551 is an apocalyptic number.

221622155551 is a deficient number, since it is larger than the sum of its proper divisors (3662086049).

221622155551 is an equidigital number, since it uses as much as digits as its factorization.

221622155551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466769.

The product of its digits is 60000, while the sum is 37.

The spelling of 221622155551 in words is "two hundred twenty-one billion, six hundred twenty-two million, one hundred fifty-five thousand, five hundred fifty-one".