21650552051 has 2 divisors, whose sum is σ = 21650552052. Its totient is φ = 21650552050.

The previous prime is 21650552029. The next prime is 21650552057. The reversal of 21650552051 is 15025505612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21650552051 - 2³⁰ = 20576810227 is a prime.

It is a super-2 number, since 2×21650552051² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21650551999 and 21650552017.

It is not a weakly prime, because it can be changed into another prime (21650552057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825276025 + 10825276026.

It is an arithmetic number, because the mean of its divisors is an integer number (10825276026).

Almost surely, 2^21650552051 is an apocalyptic number.

21650552051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650552051 is an equidigital number, since it uses as much as digits as its factorization.

21650552051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 21650552051 in words is "twenty-one billion, six hundred fifty million, five hundred fifty-two thousand, fifty-one".