21621224006422 has 4 divisors (see below), whose sum is σ = 32431836009636. Its totient is φ = 10810612003210.

The previous prime is 21621224006419. The next prime is 21621224006441. The reversal of 21621224006422 is 22460042212612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405306001604 + ... + 5405306001607.

It is an arithmetic number, because the mean of its divisors is an integer number (8107959002409).

Almost surely, 2^{21621224006422} is an apocalyptic number.

21621224006422 is a deficient number, since it is larger than the sum of its proper divisors (10810612003214).

21621224006422 is a wasteful number, since it uses less digits than its factorization.

21621224006422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10810612003213.

The product of its (nonzero) digits is 36864, while the sum is 34.

The spelling of 21621224006422 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twenty-four million, six thousand, four hundred twenty-two".