21000122201212 has 48 divisors (see below), whose sum is σ = 45908465379840. Its totient is φ = 8165791339200.

The previous prime is 21000122201209. The next prime is 21000122201231. The reversal of 21000122201212 is 21210222100012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66819864 + ... + 67133407.

It is an arithmetic number, because the mean of its divisors is an integer number (956426362080).

Almost surely, 2^{21000122201212} is an apocalyptic number.

21000122201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000122201212 is an abundant number, since it is smaller than the sum of its proper divisors (24908343178628).

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

21000122201212 is a wasteful number, since it uses less digits than its factorization.

21000122201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133953802 (or 133953800 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21000122201212 its reverse (21210222100012), we get a palindrome (42210344301224).

The spelling of 21000122201212 in words is "twenty-one trillion, one hundred twenty-two million, two hundred one thousand, two hundred twelve".