21321022022 has 16 divisors (see below), whose sum is σ = 33866158320. Its totient is φ = 10032427008.

The previous prime is 21321022013. The next prime is 21321022087. The reversal of 21321022022 is 22022012312.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405638 + ... + 455174.

It is an arithmetic number, because the mean of its divisors is an integer number (2116634895).

Almost surely, 2^21321022022 is an apocalyptic number.

21321022022 is a deficient number, since it is larger than the sum of its proper divisors (12545136298).

21321022022 is a wasteful number, since it uses less digits than its factorization.

21321022022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62215.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21321022022 its reverse (22022012312), we get a palindrome (43343034334).

The spelling of 21321022022 in words is "twenty-one billion, three hundred twenty-one million, twenty-two thousand, twenty-two".