21020001000122 has 8 divisors (see below), whose sum is σ = 33384707470836. Its totient is φ = 9891765176512.

The previous prime is 21020001000091. The next prime is 21020001000169. The reversal of 21020001000122 is 22100010002012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15954120936121 + 5065880064001 = 3994261^2 + 2250751^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 309117661733 + ... + 309117661800.

Almost surely, 2^{21020001000122} is an apocalyptic number.

21020001000122 is a deficient number, since it is larger than the sum of its proper divisors (12364706470714).

21020001000122 is a wasteful number, since it uses less digits than its factorization.

21020001000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618235323552.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21020001000122 its reverse (22100010002012), we get a palindrome (43120011002134).

The spelling of 21020001000122 in words is "twenty-one trillion, twenty billion, one million, one hundred twenty-two", and thus it is an aban number.