21012001200122 has 8 divisors (see below), whose sum is σ = 31518123751872. Its totient is φ = 10505959949500.

The previous prime is 21012001200097. The next prime is 21012001200161. The reversal of 21012001200122 is 22100210021012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21012001200097 and 21012001200106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19675004 + ... + 20715447.

It is an arithmetic number, because the mean of its divisors is an integer number (3939765468984).

Almost surely, 2^{21012001200122} is an apocalyptic number.

21012001200122 is a deficient number, since it is larger than the sum of its proper divisors (10506122551750).

21012001200122 is a wasteful number, since it uses less digits than its factorization.

21012001200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40650564.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012001200122 its reverse (22100210021012), we get a palindrome (43112211221134).

The spelling of 21012001200122 in words is "twenty-one trillion, twelve billion, one million, two hundred thousand, one hundred twenty-two".