21602811655927 has 2 divisors, whose sum is σ = 21602811655928. Its totient is φ = 21602811655926.

The previous prime is 21602811655861. The next prime is 21602811655967. The reversal of 21602811655927 is 72955611820612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21602811655927 - 2²³ = 21602803267319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21602811655967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801405827963 + 10801405827964.

It is an arithmetic number, because the mean of its divisors is an integer number (10801405827964).

Almost surely, 2^{21602811655927} is an apocalyptic number.

21602811655927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21602811655927 is an equidigital number, since it uses as much as digits as its factorization.

21602811655927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The spelling of 21602811655927 in words is "twenty-one trillion, six hundred two billion, eight hundred eleven million, six hundred fifty-five thousand, nine hundred twenty-seven".