21404402412 has 24 divisors (see below), whose sum is σ = 49954016112. Its totient is φ = 7133313600.

The previous prime is 21404402401. The next prime is 21404402413. The reversal of 21404402412 is 21420440412.

It is a super-2 number, since 2×21404402412² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21404402413) 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, 125139 + ... + 241802.

It is an arithmetic number, because the mean of its divisors is an integer number (2081417338).

Almost surely, 2^21404402412 is an apocalyptic number.

It is an amenable number.

21404402412 is an abundant number, since it is smaller than the sum of its proper divisors (28549613700).

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

21404402412 is a wasteful number, since it uses less digits than its factorization.

21404402412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371809 (or 371807 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21404402412 its reverse (21420440412), we get a palindrome (42824842824).

The spelling of 21404402412 in words is "twenty-one billion, four hundred four million, four hundred two thousand, four hundred twelve".