10400121420 has 72 divisors (see below), whose sum is σ = 31532706576. Its totient is φ = 2560027392.

The previous prime is 10400121401. The next prime is 10400121437. The reversal of 10400121420 is 2412100401.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 10400121420.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 502687 + ... + 522966.

It is an arithmetic number, because the mean of its divisors is an integer number (437954258).

Almost surely, 2^10400121420 is an apocalyptic number.

10400121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10400121420 is an abundant number, since it is smaller than the sum of its proper divisors (21132585156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10400121420 is a wasteful number, since it uses less digits than its factorization.

10400121420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025691 (or 1025676 counting only the distinct ones).

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

Adding to 10400121420 its reverse (2412100401), we get a palindrome (12812221821).

The spelling of 10400121420 in words is "ten billion, four hundred million, one hundred twenty-one thousand, four hundred twenty".