10120400021 has 8 divisors (see below), whose sum is σ = 10197555264. Its totient is φ = 10043292640.

The previous prime is 10120399997. The next prime is 10120400029. The reversal of 10120400021 is 12000402101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10120400021 - 2²² = 10116205717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10120399975 and 10120400011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120400029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492866 + ... + 512988.

It is an arithmetic number, because the mean of its divisors is an integer number (1274694408).

Almost surely, 2^10120400021 is an apocalyptic number.

It is an amenable number.

10120400021 is a deficient number, since it is larger than the sum of its proper divisors (77155243).

10120400021 is a wasteful number, since it uses less digits than its factorization.

10120400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23931.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10120400021 its reverse (12000402101), we get a palindrome (22120802122).

The spelling of 10120400021 in words is "ten billion, one hundred twenty million, four hundred thousand, twenty-one".