21222020356635 has 64 divisors (see below), whose sum is σ = 40520545228800. Its totient is φ = 9273423498240.

The previous prime is 21222020356613. The next prime is 21222020356651. The reversal of 21222020356635 is 53665302022212.

It is not a de Polignac number, because 21222020356635 - 2⁹ = 21222020356123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222020356593 and 21222020356602.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 609841 + ... + 6543389.

It is an arithmetic number, because the mean of its divisors is an integer number (633133519200).

Almost surely, 2^{21222020356635} is an apocalyptic number.

21222020356635 is a deficient number, since it is larger than the sum of its proper divisors (19298524872165).

21222020356635 is a wasteful number, since it uses less digits than its factorization.

21222020356635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935068.

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 21222020356635 its reverse (53665302022212), we get a palindrome (74887322378847).

The spelling of 21222020356635 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, three hundred fifty-six thousand, six hundred thirty-five".