20010012121 has 12 divisors (see below), whose sum is σ = 22950760896. Its totient is φ = 17400008120.

The previous prime is 20010012103. The next prime is 20010012131. The reversal of 20010012121 is 12121001002.

It is a de Polignac number, because none of the positive numbers 2^k-20010012121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010012098 and 20010012107.

It is not an unprimeable number, because it can be changed into a prime (20010012101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3592261 + ... + 3597826.

It is an arithmetic number, because the mean of its divisors is an integer number (1912563408).

Almost surely, 2^20010012121 is an apocalyptic number.

It is an amenable number.

20010012121 is a deficient number, since it is larger than the sum of its proper divisors (2940748775).

20010012121 is a wasteful number, since it uses less digits than its factorization.

20010012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7190132 (or 7190121 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20010012121 its reverse (12121001002), we get a palindrome (32131013123).

The spelling of 20010012121 in words is "twenty billion, ten million, twelve thousand, one hundred twenty-one".