21200121100122 has 16 divisors (see below), whose sum is σ = 44894374094592. Its totient is φ = 6651018384320.

The previous prime is 21200121100117. The next prime is 21200121100199. The reversal of 21200121100122 is 22100112100212.

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, 103922162154 + ... + 103922162357.

It is an arithmetic number, because the mean of its divisors is an integer number (2805898380912).

Almost surely, 2^{21200121100122} is an apocalyptic number.

21200121100122 is an abundant number, since it is smaller than the sum of its proper divisors (23694252994470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200121100122 is a wasteful number, since it uses less digits than its factorization.

21200121100122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207844324533.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200121100122 its reverse (22100112100212), we get a palindrome (43300233200334).

The spelling of 21200121100122 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one million, one hundred thousand, one hundred twenty-two".