21001022011122 has 16 divisors (see below), whose sum is σ = 42053079322560. Its totient is φ = 6991834786992.

The previous prime is 21001022011043. The next prime is 21001022011141. The reversal of 21001022011122 is 22111022010012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2126465497 + ... + 2126475372.

It is an arithmetic number, because the mean of its divisors is an integer number (2628317457660).

Almost surely, 2^{21001022011122} is an apocalyptic number.

21001022011122 is an abundant number, since it is smaller than the sum of its proper divisors (21052057311438).

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

21001022011122 is a wasteful number, since it uses less digits than its factorization.

21001022011122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252941697.

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

Adding to 21001022011122 its reverse (22111022010012), we get a palindrome (43112044021134).

The spelling of 21001022011122 in words is "twenty-one trillion, one billion, twenty-two million, eleven thousand, one hundred twenty-two".