21313130981777 has 16 divisors (see below), whose sum is σ = 22550870865600. Its totient is φ = 20087009933760.

The previous prime is 21313130981759. The next prime is 21313130981783. The reversal of 21313130981777 is 77718903131312.

It is a cyclic number.

It is not a de Polignac number, because 21313130981777 - 2¹² = 21313130977681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313130980777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40503599 + ... + 41026427.

It is an arithmetic number, because the mean of its divisors is an integer number (1409429429100).

Almost surely, 2^{21313130981777} is an apocalyptic number.

It is an amenable number.

21313130981777 is a deficient number, since it is larger than the sum of its proper divisors (1237739883823).

21313130981777 is a wasteful number, since it uses less digits than its factorization.

21313130981777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533936.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 21313130981777 in words is "twenty-one trillion, three hundred thirteen billion, one hundred thirty million, nine hundred eighty-one thousand, seven hundred seventy-seven".