21000202121122 has 16 divisors (see below), whose sum is σ = 36000585815040. Its totient is φ = 9000026792928.

The previous prime is 21000202121071. The next prime is 21000202121147. The reversal of 21000202121122 is 22112120200012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21000202121096 and 21000202121105.

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, 2770747 + ... + 7048222.

It is an arithmetic number, because the mean of its divisors is an integer number (2250036613440).

Almost surely, 2^{21000202121122} is an apocalyptic number.

21000202121122 is a deficient number, since it is larger than the sum of its proper divisors (15000383693918).

21000202121122 is a wasteful number, since it uses less digits than its factorization.

21000202121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9971745.

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

Adding to 21000202121122 its reverse (22112120200012), we get a palindrome (43112322321134).

The spelling of 21000202121122 in words is "twenty-one trillion, two hundred two million, one hundred twenty-one thousand, one hundred twenty-two".