21201733213 has 2 divisors, whose sum is σ = 21201733214. Its totient is φ = 21201733212.

The previous prime is 21201733207. The next prime is 21201733253. The reversal of 21201733213 is 31233710212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20404122649 + 797610564 = 142843^2 + 28242^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201733213 - 2¹³ = 21201725021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201733253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600866606 + 10600866607.

It is an arithmetic number, because the mean of its divisors is an integer number (10600866607).

Almost surely, 2^21201733213 is an apocalyptic number.

It is an amenable number.

21201733213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201733213 is an equidigital number, since it uses as much as digits as its factorization.

21201733213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The spelling of 21201733213 in words is "twenty-one billion, two hundred one million, seven hundred thirty-three thousand, two hundred thirteen".