21222001002021 has 16 divisors (see below), whose sum is σ = 29863853683200. Its totient is φ = 13368003950448.

The previous prime is 21222001001959. The next prime is 21222001002047. The reversal of 21222001002021 is 12020010022212.

It is not a de Polignac number, because 21222001002021 - 2⁷ = 21222001001893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222001006021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 491160201 + ... + 491203406.

It is an arithmetic number, because the mean of its divisors is an integer number (1866490855200).

Almost surely, 2^{21222001002021} is an apocalyptic number.

It is an amenable number.

21222001002021 is a deficient number, since it is larger than the sum of its proper divisors (8641852681179).

21222001002021 is a wasteful number, since it uses less digits than its factorization.

21222001002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982364008.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222001002021 its reverse (12020010022212), we get a palindrome (33242011024233).

The spelling of 21222001002021 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two thousand, twenty-one".