21000122221022 has 12 divisors (see below), whose sum is σ = 36643070406240. Its totient is φ = 9000052380396.

The previous prime is 21000122221007. The next prime is 21000122221031. The reversal of 21000122221022 is 22012222100012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107143480622 + ... + 107143480817.

It is an arithmetic number, because the mean of its divisors is an integer number (3053589200520).

Almost surely, 2^{21000122221022} is an apocalyptic number.

21000122221022 is a deficient number, since it is larger than the sum of its proper divisors (15642948185218).

21000122221022 is a wasteful number, since it uses less digits than its factorization.

21000122221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214286961455 (or 214286961448 counting only the distinct ones).

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

Adding to 21000122221022 its reverse (22012222100012), we get a palindrome (43012344321034).

The spelling of 21000122221022 in words is "twenty-one trillion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-two".