21402221404 has 6 divisors (see below), whose sum is σ = 37453887464. Its totient is φ = 10701110700.

The previous prime is 21402221381. The next prime is 21402221413. The reversal of 21402221404 is 40412220412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675277672 + ... + 2675277679.

Almost surely, 2^21402221404 is an apocalyptic number.

It is an amenable number.

21402221404 is a deficient number, since it is larger than the sum of its proper divisors (16051666060).

21402221404 is a wasteful number, since it uses less digits than its factorization.

21402221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350555355 (or 5350555353 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21402221404 its reverse (40412220412), we get a palindrome (61814441816).

The spelling of 21402221404 in words is "twenty-one billion, four hundred two million, two hundred twenty-one thousand, four hundred four".