21050555023 has 2 divisors, whose sum is σ = 21050555024. Its totient is φ = 21050555022.

The previous prime is 21050554957. The next prime is 21050555027. The reversal of 21050555023 is 32055505012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21050555023 - 2¹³ = 21050546831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21050554982 and 21050555000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21050555027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525277511 + 10525277512.

It is an arithmetic number, because the mean of its divisors is an integer number (10525277512).

Almost surely, 2^21050555023 is an apocalyptic number.

21050555023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050555023 is an equidigital number, since it uses as much as digits as its factorization.

21050555023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 28.

The spelling of 21050555023 in words is "twenty-one billion, fifty million, five hundred fifty-five thousand, twenty-three".