20021012121 has 8 divisors (see below), whose sum is σ = 29121472224. Its totient is φ = 12133946720.

The previous prime is 20021012059. The next prime is 20021012161. The reversal of 20021012121 is 12121012002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20021012121 - 2¹¹ = 20021010073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021012097 and 20021012106.

It is not an unprimeable number, because it can be changed into a prime (20021012161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303348636 + ... + 303348701.

It is an arithmetic number, because the mean of its divisors is an integer number (3640184028).

Almost surely, 2^20021012121 is an apocalyptic number.

It is an amenable number.

20021012121 is a deficient number, since it is larger than the sum of its proper divisors (9100460103).

20021012121 is a wasteful number, since it uses less digits than its factorization.

20021012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606697351.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021012121 its reverse (12121012002), we get a palindrome (32142024123).

The spelling of 20021012121 in words is "twenty billion, twenty-one million, twelve thousand, one hundred twenty-one".