21421424402 has 32 divisors (see below), whose sum is σ = 36938073600. Its totient is φ = 9126825408.

The previous prime is 21421424393. The next prime is 21421424477. The reversal of 21421424402 is 20442412412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2300468 + ... + 2309760.

It is an arithmetic number, because the mean of its divisors is an integer number (1154314800).

Almost surely, 2^21421424402 is an apocalyptic number.

21421424402 is a deficient number, since it is larger than the sum of its proper divisors (15516649198).

21421424402 is a wasteful number, since it uses less digits than its factorization.

21421424402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10250.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21421424402 its reverse (20442412412), we get a palindrome (41863836814).

The spelling of 21421424402 in words is "twenty-one billion, four hundred twenty-one million, four hundred twenty-four thousand, four hundred two".