21314394293 has 2 divisors, whose sum is σ = 21314394294. Its totient is φ = 21314394292.

The previous prime is 21314394259. The next prime is 21314394337. The reversal of 21314394293 is 39249341312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21313956049 + 438244 = 145993^2 + 662^2 .

It is a cyclic number.

It is not a de Polignac number, because 21314394293 - 2¹² = 21314390197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21314394293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21314394253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657197146 + 10657197147.

It is an arithmetic number, because the mean of its divisors is an integer number (10657197147).

Almost surely, 2^21314394293 is an apocalyptic number.

It is an amenable number.

21314394293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314394293 is an equidigital number, since it uses as much as digits as its factorization.

21314394293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The spelling of 21314394293 in words is "twenty-one billion, three hundred fourteen million, three hundred ninety-four thousand, two hundred ninety-three".