21420223022 has 64 divisors (see below), whose sum is σ = 36464836608. Its totient is φ = 9352812000.

The previous prime is 21420223009. The next prime is 21420223031. The reversal of 21420223022 is 22032202412.

It is a junction number, because it is equal to n+sod(n) for n = 21420222985 and 21420223003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20775647 + ... + 20776677.

It is an arithmetic number, because the mean of its divisors is an integer number (569763072).

Almost surely, 2^21420223022 is an apocalyptic number.

21420223022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21420223022 is a deficient number, since it is larger than the sum of its proper divisors (15044613586).

21420223022 is a wasteful number, since it uses less digits than its factorization.

21420223022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21420223022 its reverse (22032202412), we get a palindrome (43452425434).

It can be divided in two parts, 21420 and 223022, that added together give a palindrome (244442).

The spelling of 21420223022 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-three thousand, twenty-two".