21424312031404 has 6 divisors (see below), whose sum is σ = 37492546054964. Its totient is φ = 10712156015700.

The previous prime is 21424312031371. The next prime is 21424312031407. The reversal of 21424312031404 is 40413021342412.

It is a happy number.

It is a super-2 number, since 2×21424312031404² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21424312031407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678039003922 + ... + 2678039003929.

Almost surely, 2^{21424312031404} is an apocalyptic number.

It is an amenable number.

21424312031404 is a deficient number, since it is larger than the sum of its proper divisors (16068234023560).

21424312031404 is a wasteful number, since it uses less digits than its factorization.

21424312031404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5356078007855 (or 5356078007853 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21424312031404 its reverse (40413021342412), we get a palindrome (61837333373816).

The spelling of 21424312031404 in words is "twenty-one trillion, four hundred twenty-four billion, three hundred twelve million, thirty-one thousand, four hundred four".