20000220121 has 16 divisors (see below), whose sum is σ = 23981544448. Its totient is φ = 16318065600.

The previous prime is 20000220073. The next prime is 20000220133. The reversal of 20000220121 is 12102200002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20000220121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20000220098 and 20000220107.

It is not an unprimeable number, because it can be changed into a prime (20000220221) 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, 742230 + ... + 768703.

It is an arithmetic number, because the mean of its divisors is an integer number (1498846528).

Almost surely, 2^20000220121 is an apocalyptic number.

It is an amenable number.

20000220121 is a deficient number, since it is larger than the sum of its proper divisors (3981324327).

20000220121 is a wasteful number, since it uses less digits than its factorization.

20000220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511032.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20000220121 its reverse (12102200002), we get a palindrome (32102420123).

The spelling of 20000220121 in words is "twenty billion, two hundred twenty thousand, one hundred twenty-one".