21012936189929 has 2 divisors, whose sum is σ = 21012936189930. Its totient is φ = 21012936189928.

The previous prime is 21012936189859. The next prime is 21012936189937. The reversal of 21012936189929 is 92998163921012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15867515394025 + 5145420795904 = 3983405^2 + 2268352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012936189929 is a prime.

It is a super-2 number, since 2×21012936189929² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21012936689929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506468094964 + 10506468094965.

It is an arithmetic number, because the mean of its divisors is an integer number (10506468094965).

Almost surely, 2^{21012936189929} is an apocalyptic number.

It is an amenable number.

21012936189929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012936189929 is an equidigital number, since it uses as much as digits as its factorization.

21012936189929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 62.

The spelling of 21012936189929 in words is "twenty-one trillion, twelve billion, nine hundred thirty-six million, one hundred eighty-nine thousand, nine hundred twenty-nine".