221755153819 has 2 divisors, whose sum is σ = 221755153820. Its totient is φ = 221755153818.

The previous prime is 221755153769. The next prime is 221755153859. The reversal of 221755153819 is 918351557122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221755153819 - 2⁹ = 221755153307 is a prime.

It is a super-2 number, since 2×221755153819² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221755153859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110877576909 + 110877576910.

It is an arithmetic number, because the mean of its divisors is an integer number (110877576910).

Almost surely, 2^221755153819 is an apocalyptic number.

221755153819 is a deficient number, since it is larger than the sum of its proper divisors (1).

221755153819 is an equidigital number, since it uses as much as digits as its factorization.

221755153819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756000, while the sum is 49.

The spelling of 221755153819 in words is "two hundred twenty-one billion, seven hundred fifty-five million, one hundred fifty-three thousand, eight hundred nineteen".