221431154630453 has 2 divisors, whose sum is σ = 221431154630454. Its totient is φ = 221431154630452.

The previous prime is 221431154630449. The next prime is 221431154630461. The reversal of 221431154630453 is 354036451134122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151012590083524 + 70418564546929 = 12288718^2 + 8391577^2 .

It is a cyclic number.

It is not a de Polignac number, because 221431154630453 - 2² = 221431154630449 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221431154630953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110715577315226 + 110715577315227.

It is an arithmetic number, because the mean of its divisors is an integer number (110715577315227).

Almost surely, 2^{221431154630453} is an apocalyptic number.

It is an amenable number.

221431154630453 is a deficient number, since it is larger than the sum of its proper divisors (1).

221431154630453 is an equidigital number, since it uses as much as digits as its factorization.

221431154630453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 221431154630453 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, one hundred fifty-four million, six hundred thirty thousand, four hundred fifty-three".