221451451211 has 2 divisors, whose sum is σ = 221451451212. Its totient is φ = 221451451210.

The previous prime is 221451451171. The next prime is 221451451223. The reversal of 221451451211 is 112154154122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221451451211 - 2²² = 221447256907 is a prime.

It is not a weakly prime, because it can be changed into another prime (221451451511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110725725605 + 110725725606.

It is an arithmetic number, because the mean of its divisors is an integer number (110725725606).

Almost surely, 2^221451451211 is an apocalyptic number.

221451451211 is a deficient number, since it is larger than the sum of its proper divisors (1).

221451451211 is an equidigital number, since it uses as much as digits as its factorization.

221451451211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 29.

The spelling of 221451451211 in words is "two hundred twenty-one billion, four hundred fifty-one million, four hundred fifty-one thousand, two hundred eleven".