21001011220122 has 8 divisors (see below), whose sum is σ = 42002022440256. Its totient is φ = 7000337073372.

The previous prime is 21001011220099. The next prime is 21001011220139. The reversal of 21001011220122 is 22102211010012.

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

21001011220122 is an admirable 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, 1750084268338 + ... + 1750084268349.

It is an arithmetic number, because the mean of its divisors is an integer number (5250252805032).

Almost surely, 2^{21001011220122} is an apocalyptic number.

21001011220122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21001011220122 is a wasteful number, since it uses less digits than its factorization.

21001011220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500168536692.

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

Adding to 21001011220122 its reverse (22102211010012), we get a palindrome (43103222230134).

The spelling of 21001011220122 in words is "twenty-one trillion, one billion, eleven million, two hundred twenty thousand, one hundred twenty-two".