921236838653 has 2 divisors, whose sum is σ = 921236838654. Its totient is φ = 921236838652.

The previous prime is 921236838637. The next prime is 921236838673. The reversal of 921236838653 is 356838632129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 818132913049 + 103103925604 = 904507^2 + 321098^2 .

It is a cyclic number.

It is not a de Polignac number, because 921236838653 - 2⁴ = 921236838637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921236838673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460618419326 + 460618419327.

It is an arithmetic number, because the mean of its divisors is an integer number (460618419327).

Almost surely, 2^921236838653 is an apocalyptic number.

It is an amenable number.

921236838653 is a deficient number, since it is larger than the sum of its proper divisors (1).

921236838653 is an equidigital number, since it uses as much as digits as its factorization.

921236838653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11197440, while the sum is 56.

The spelling of 921236838653 in words is "nine hundred twenty-one billion, two hundred thirty-six million, eight hundred thirty-eight thousand, six hundred fifty-three".