21201012002122 has 64 divisors (see below), whose sum is σ = 34113758342400. Its totient is φ = 9846783820800.

The previous prime is 21201012002117. The next prime is 21201012002129. The reversal of 21201012002122 is 22120021010212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21201012002096 and 21201012002105.

It is not an unprimeable number, because it can be changed into a prime (21201012002129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1852743733 + ... + 1852755175.

It is an arithmetic number, because the mean of its divisors is an integer number (533027474100).

Almost surely, 2^{21201012002122} is an apocalyptic number.

21201012002122 is a deficient number, since it is larger than the sum of its proper divisors (12912746340278).

21201012002122 is a wasteful number, since it uses less digits than its factorization.

21201012002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13231.

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

Adding to 21201012002122 its reverse (22120021010212), we get a palindrome (43321033012334).

The spelling of 21201012002122 in words is "twenty-one trillion, two hundred one billion, twelve million, two thousand, one hundred twenty-two".