21634533377 has 2 divisors, whose sum is σ = 21634533378. Its totient is φ = 21634533376.

The previous prime is 21634533373. The next prime is 21634533409. The reversal of 21634533377 is 77333543612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21627820096 + 6713281 = 147064^2 + 2591^2 .

It is a cyclic number.

It is not a de Polignac number, because 21634533377 - 2² = 21634533373 is a prime.

It is not a weakly prime, because it can be changed into another prime (21634533373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817266688 + 10817266689.

It is an arithmetic number, because the mean of its divisors is an integer number (10817266689).

Almost surely, 2^21634533377 is an apocalyptic number.

It is an amenable number.

21634533377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21634533377 is an equidigital number, since it uses as much as digits as its factorization.

21634533377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 44.

The spelling of 21634533377 in words is "twenty-one billion, six hundred thirty-four million, five hundred thirty-three thousand, three hundred seventy-seven".