20101120202121 has 16 divisors (see below), whose sum is σ = 30630374627328. Its totient is φ = 11486318317200.

The previous prime is 20101120202113. The next prime is 20101120202143. The reversal of 20101120202121 is 12120202110102.

It is not a de Polignac number, because 20101120202121 - 2³ = 20101120202113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20101120202121.

It is not an unprimeable number, because it can be changed into a prime (20101120202171) 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, 6276726 + ... + 8921856.

It is an arithmetic number, because the mean of its divisors is an integer number (1914398414208).

Almost surely, 2^{20101120202121} is an apocalyptic number.

20101120202121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20101120202121 is a deficient number, since it is larger than the sum of its proper divisors (10529254425207).

20101120202121 is a wasteful number, since it uses less digits than its factorization.

20101120202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007012.

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

Adding to 20101120202121 its reverse (12120202110102), we get a palindrome (32221322312223).

The spelling of 20101120202121 in words is "twenty trillion, one hundred one billion, one hundred twenty million, two hundred two thousand, one hundred twenty-one".