20012102210121 has 16 divisors (see below), whose sum is σ = 30544870232064. Its totient is φ = 11416647617424.

The previous prime is 20012102210119. The next prime is 20012102210123. The reversal of 20012102210121 is 12101220121002.

It is an interprime number because it is at equal distance from previous prime (20012102210119) and next prime (20012102210123).

It is not a de Polignac number, because 20012102210121 - 2¹ = 20012102210119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012102210121.

It is not an unprimeable number, because it can be changed into a prime (20012102210123) 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, 784960275 + ... + 784985768.

It is an arithmetic number, because the mean of its divisors is an integer number (1909054389504).

Almost surely, 2^{20012102210121} is an apocalyptic number.

20012102210121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20012102210121 is a deficient number, since it is larger than the sum of its proper divisors (10532768021943).

20012102210121 is a wasteful number, since it uses less digits than its factorization.

20012102210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569946660.

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

Adding to 20012102210121 its reverse (12101220121002), we get a palindrome (32113322331123).

The spelling of 20012102210121 in words is "twenty trillion, twelve billion, one hundred two million, two hundred ten thousand, one hundred twenty-one".