21234177511 has 2 divisors, whose sum is σ = 21234177512. Its totient is φ = 21234177510.

The previous prime is 21234177487. The next prime is 21234177571. The reversal of 21234177511 is 11577143212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21234177511 - 2⁷ = 21234177383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234177571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617088755 + 10617088756.

It is an arithmetic number, because the mean of its divisors is an integer number (10617088756).

Almost surely, 2^21234177511 is an apocalyptic number.

21234177511 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234177511 is an equidigital number, since it uses as much as digits as its factorization.

21234177511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The spelling of 21234177511 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, five hundred eleven".