21310100293 has 2 divisors, whose sum is σ = 21310100294. Its totient is φ = 21310100292.

The previous prime is 21310100291. The next prime is 21310100381. The reversal of 21310100293 is 39200101312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14507479809 + 6802620484 = 120447^2 + 82478^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310100293 - 2¹ = 21310100291 is a prime.

Together with 21310100291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310100291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655050146 + 10655050147.

It is an arithmetic number, because the mean of its divisors is an integer number (10655050147).

Almost surely, 2^21310100293 is an apocalyptic number.

It is an amenable number.

21310100293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310100293 is an equidigital number, since it uses as much as digits as its factorization.

21310100293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21310100293 in words is "twenty-one billion, three hundred ten million, one hundred thousand, two hundred ninety-three".