10120400421 has 16 divisors (see below), whose sum is σ = 13734494208. Its totient is φ = 6627322800.

The previous prime is 10120400417. The next prime is 10120400429. The reversal of 10120400421 is 12400402101.

It is not a de Polignac number, because 10120400421 - 2² = 10120400417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10120400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120400429) 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, 29941 + ... + 145386.

It is an arithmetic number, because the mean of its divisors is an integer number (858405888).

Almost surely, 2^10120400421 is an apocalyptic number.

It is an amenable number.

10120400421 is a deficient number, since it is larger than the sum of its proper divisors (3614093787).

10120400421 is a wasteful number, since it uses less digits than its factorization.

10120400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175672.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 10120400421 its reverse (12400402101), we get a palindrome (22520802522).

The spelling of 10120400421 in words is "ten billion, one hundred twenty million, four hundred thousand, four hundred twenty-one".