21357901093 has 2 divisors, whose sum is σ = 21357901094. Its totient is φ = 21357901092.

The previous prime is 21357901087. The next prime is 21357901133. The reversal of 21357901093 is 39010975312.

It is an a-pointer prime, because the next prime (21357901133) can be obtained adding 21357901093 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21349008769 + 8892324 = 146113^2 + 2982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21357901093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21357901013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678950546 + 10678950547.

It is an arithmetic number, because the mean of its divisors is an integer number (10678950547).

Almost surely, 2^21357901093 is an apocalyptic number.

It is an amenable number.

21357901093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21357901093 is an equidigital number, since it uses as much as digits as its factorization.

21357901093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 40.

The spelling of 21357901093 in words is "twenty-one billion, three hundred fifty-seven million, nine hundred one thousand, ninety-three".