20120001212121 has 16 divisors (see below), whose sum is σ = 27481191077760. Its totient is φ = 13086077834880.

The previous prime is 20120001212117. The next prime is 20120001212149. The reversal of 20120001212121 is 12121210002102.

It is not a de Polignac number, because 20120001212121 - 2² = 20120001212117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20120001212121.

It is not an unprimeable number, because it can be changed into a prime (20120001212021) 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, 17278935 + ... + 18406563.

It is an arithmetic number, because the mean of its divisors is an integer number (1717574442360).

Almost surely, 2^{20120001212121} is an apocalyptic number.

It is an amenable number.

20120001212121 is a deficient number, since it is larger than the sum of its proper divisors (7361189865639).

20120001212121 is a wasteful number, since it uses less digits than its factorization.

20120001212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272736.

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

Adding to 20120001212121 its reverse (12121210002102), we get a palindrome (32241211214223).

The spelling of 20120001212121 in words is "twenty trillion, one hundred twenty billion, one million, two hundred twelve thousand, one hundred twenty-one".