21112091621393 has 2 divisors, whose sum is σ = 21112091621394. Its totient is φ = 21112091621392.

The previous prime is 21112091621351. The next prime is 21112091621407. The reversal of 21112091621393 is 39312619021112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20714040407824 + 398051213569 = 4551268^2 + 630913^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112091621393 - 2⁶ = 21112091621329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112091621393.

It is not a weakly prime, because it can be changed into another prime (21112091681393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556045810696 + 10556045810697.

It is an arithmetic number, because the mean of its divisors is an integer number (10556045810697).

Almost surely, 2^{21112091621393} is an apocalyptic number.

It is an amenable number.

21112091621393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112091621393 is an equidigital number, since it uses as much as digits as its factorization.

21112091621393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 21112091621393 in words is "twenty-one trillion, one hundred twelve billion, ninety-one million, six hundred twenty-one thousand, three hundred ninety-three".