21077110531 has 2 divisors, whose sum is σ = 21077110532. Its totient is φ = 21077110530.

The previous prime is 21077110519. The next prime is 21077110541. The reversal of 21077110531 is 13501177012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21077110531 - 2²³ = 21068721923 is a prime.

It is a super-2 number, since 2×21077110531² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21077110531.

It is not a weakly prime, because it can be changed into another prime (21077110511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538555265 + 10538555266.

It is an arithmetic number, because the mean of its divisors is an integer number (10538555266).

Almost surely, 2^21077110531 is an apocalyptic number.

21077110531 is a deficient number, since it is larger than the sum of its proper divisors (1).

21077110531 is an equidigital number, since it uses as much as digits as its factorization.

21077110531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 28.

Adding to 21077110531 its reverse (13501177012), we get a palindrome (34578287543).

The spelling of 21077110531 in words is "twenty-one billion, seventy-seven million, one hundred ten thousand, five hundred thirty-one".