20101210012121 has 16 divisors (see below), whose sum is σ = 22981269196800. Its totient is φ = 17223266485248.

The previous prime is 20101210012111. The next prime is 20101210012133. The reversal of 20101210012121 is 12121001210102.

It is a cyclic number.

It is not a de Polignac number, because 20101210012121 - 2²² = 20101205817817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20101210012096 and 20101210012105.

It is not an unprimeable number, because it can be changed into a prime (20101210012111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222710120 + ... + 222800358.

It is an arithmetic number, because the mean of its divisors is an integer number (1436329324800).

Almost surely, 2^{20101210012121} is an apocalyptic number.

It is an amenable number.

20101210012121 is a deficient number, since it is larger than the sum of its proper divisors (2880059184679).

20101210012121 is an equidigital number, since it uses as much as digits as its factorization.

20101210012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101608.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20101210012121 its reverse (12121001210102), we get a palindrome (32222211222223).

The spelling of 20101210012121 in words is "twenty trillion, one hundred one billion, two hundred ten million, twelve thousand, one hundred twenty-one".