21140400404 has 48 divisors (see below), whose sum is σ = 37664355456. Its totient is φ = 10381478400.

The previous prime is 21140400383. The next prime is 21140400409. The reversal of 21140400404 is 40400404112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140400409) 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, 27779384 + ... + 27780144.

It is an arithmetic number, because the mean of its divisors is an integer number (784674072).

Almost surely, 2^21140400404 is an apocalyptic number.

It is an amenable number.

21140400404 is a deficient number, since it is larger than the sum of its proper divisors (16523955052).

21140400404 is a wasteful number, since it uses less digits than its factorization.

21140400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21140400404 its reverse (40400404112), we get a palindrome (61540804516).

The spelling of 21140400404 in words is "twenty-one billion, one hundred forty million, four hundred thousand, four hundred four".