21001021011222 has 32 divisors (see below), whose sum is σ = 49657586630400. Its totient is φ = 5793385106208.

The previous prime is 21001021011211. The next prime is 21001021011233. The reversal of 21001021011222 is 22211012010012.

It is an interprime number because it is at equal distance from previous prime (21001021011211) and next prime (21001021011233).

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 15 ways as a sum of consecutive naturals, for example, 8621107572 + ... + 8621110007.

It is an arithmetic number, because the mean of its divisors is an integer number (1551799582200).

Almost surely, 2^{21001021011222} is an apocalyptic number.

21001021011222 is an abundant number, since it is smaller than the sum of its proper divisors (28656565619178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001021011222 is a wasteful number, since it uses less digits than its factorization.

21001021011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17242217620.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21001021011222 its reverse (22211012010012), we get a palindrome (43212033021234).

The spelling of 21001021011222 in words is "twenty-one trillion, one billion, twenty-one million, eleven thousand, two hundred twenty-two".