21036094493 has 2 divisors, whose sum is σ = 21036094494. Its totient is φ = 21036094492.

The previous prime is 21036094487. The next prime is 21036094553. The reversal of 21036094493 is 39449063012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20010365764 + 1025728729 = 141458^2 + 32027^2 .

It is a cyclic number.

It is not a de Polignac number, because 21036094493 - 2⁴ = 21036094477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21036094493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21036094433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518047246 + 10518047247.

It is an arithmetic number, because the mean of its divisors is an integer number (10518047247).

Almost surely, 2^21036094493 is an apocalyptic number.

It is an amenable number.

21036094493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21036094493 is an equidigital number, since it uses as much as digits as its factorization.

21036094493 is an evil number, because the sum of its binary digits is even.

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

The spelling of 21036094493 in words is "twenty-one billion, thirty-six million, ninety-four thousand, four hundred ninety-three".