21003110877 has 96 divisors (see below), whose sum is σ = 34193940480. Its totient is φ = 11224362240.

The previous prime is 21003110867. The next prime is 21003110879. The reversal of 21003110877 is 77801130012.

It is not a de Polignac number, because 21003110877 - 2⁴ = 21003110861 is a prime.

It is a super-2 number, since 2×21003110877² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003110879) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 125767048 + ... + 125767214.

It is an arithmetic number, because the mean of its divisors is an integer number (356186880).

Almost surely, 2^21003110877 is an apocalyptic number.

It is an amenable number.

21003110877 is a deficient number, since it is larger than the sum of its proper divisors (13190829603).

21003110877 is a wasteful number, since it uses less digits than its factorization.

21003110877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 30.

Adding to 21003110877 its reverse (77801130012), we get a palindrome (98804240889).

The spelling of 21003110877 in words is "twenty-one billion, three million, one hundred ten thousand, eight hundred seventy-seven".