21235452677 has 2 divisors, whose sum is σ = 21235452678. Its totient is φ = 21235452676.

The previous prime is 21235452659. The next prime is 21235452731. The reversal of 21235452677 is 77625453212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12903596836 + 8331855841 = 113594^2 + 91279^2 .

It is a cyclic number.

It is not a de Polignac number, because 21235452677 - 2¹⁴ = 21235436293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21235452617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617726338 + 10617726339.

It is an arithmetic number, because the mean of its divisors is an integer number (10617726339).

Almost surely, 2^21235452677 is an apocalyptic number.

It is an amenable number.

21235452677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21235452677 is an equidigital number, since it uses as much as digits as its factorization.

21235452677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 44.

The spelling of 21235452677 in words is "twenty-one billion, two hundred thirty-five million, four hundred fifty-two thousand, six hundred seventy-seven".