21000122101012 has 12 divisors (see below), whose sum is σ = 36751105246996. Its totient is φ = 10499806316160.

The previous prime is 21000122100973. The next prime is 21000122101019. The reversal of 21000122101012 is 21010122100012.

It can be written as a sum of positive squares in 2 ways, for example, as 12922328215696 + 8077793885316 = 3594764^2 + 2842146^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21000122100983 and 21000122101001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000122101019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63498039 + ... + 63827902.

Almost surely, 2^{21000122101012} is an apocalyptic number.

It is an amenable number.

21000122101012 is a deficient number, since it is larger than the sum of its proper divisors (15750983145984).

21000122101012 is a wasteful number, since it uses less digits than its factorization.

21000122101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127367178 (or 127367176 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000122101012 its reverse (21010122100012), we get a palindrome (42010244201024).

It can be divided in two parts, 2100012 and 2101012, that added together give a palindrome (4201024).

The spelling of 21000122101012 in words is "twenty-one trillion, one hundred twenty-two million, one hundred one thousand, twelve".