221278041631 has 2 divisors, whose sum is σ = 221278041632. Its totient is φ = 221278041630.

The previous prime is 221278041601. The next prime is 221278041641. The reversal of 221278041631 is 136140872122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221278041631 - 2¹³ = 221278033439 is a prime.

It is a super-2 number, since 2×221278041631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221278041601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110639020815 + 110639020816.

It is an arithmetic number, because the mean of its divisors is an integer number (110639020816).

Almost surely, 2^221278041631 is an apocalyptic number.

221278041631 is a deficient number, since it is larger than the sum of its proper divisors (1).

221278041631 is an equidigital number, since it uses as much as digits as its factorization.

221278041631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 221278041631 in words is "two hundred twenty-one billion, two hundred seventy-eight million, forty-one thousand, six hundred thirty-one".