21420222996 has 24 divisors (see below), whose sum is σ = 50189650560. Its totient is φ = 7110198592.

The previous prime is 21420222919. The next prime is 21420222997. The reversal of 21420222996 is 69922202412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420222997) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 3731481 + ... + 3737216.

It is an arithmetic number, because the mean of its divisors is an integer number (2091235440).

Almost surely, 2^21420222996 is an apocalyptic number.

It is an amenable number.

21420222996 is an abundant number, since it is smaller than the sum of its proper divisors (28769427564).

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

21420222996 is a wasteful number, since it uses less digits than its factorization.

21420222996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7468943 (or 7468941 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 21420222996 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-two thousand, nine hundred ninety-six".