21000212221022 has 8 divisors (see below), whose sum is σ = 31931829541776. Its totient is φ = 10356269040432.

The previous prime is 21000212220991. The next prime is 21000212221039. The reversal of 21000212221022 is 22012221200012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71918534858 + ... + 71918535149.

It is an arithmetic number, because the mean of its divisors is an integer number (3991478692722).

Almost surely, 2^{21000212221022} is an apocalyptic number.

21000212221022 is a deficient number, since it is larger than the sum of its proper divisors (10931617320754).

21000212221022 is a wasteful number, since it uses less digits than its factorization.

21000212221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143837070082.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21000212221022 its reverse (22012221200012), we get a palindrome (43012433421034).

The spelling of 21000212221022 in words is "twenty-one trillion, two hundred twelve million, two hundred twenty-one thousand, twenty-two".