12855700021 has 2 divisors, whose sum is σ = 12855700022. Its totient is φ = 12855700020.

The previous prime is 12855699979. The next prime is 12855700037. The reversal of 12855700021 is 12000755821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8928171121 + 3927528900 = 94489^2 + 62670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12855700021 - 2⁹ = 12855699509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12855700421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6427850010 + 6427850011.

It is an arithmetic number, because the mean of its divisors is an integer number (6427850011).

Almost surely, 2^12855700021 is an apocalyptic number.

It is an amenable number.

12855700021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12855700021 is an equidigital number, since it uses as much as digits as its factorization.

12855700021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 31.

The spelling of 12855700021 in words is "twelve billion, eight hundred fifty-five million, seven hundred thousand, twenty-one".