20210220121 has 8 divisors (see below), whose sum is σ = 24874117184. Its totient is φ = 15990503760.

The previous prime is 20210220119. The next prime is 20210220131. The reversal of 20210220121 is 12102201202.

It is a happy number.

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

It is not a de Polignac number, because 20210220121 - 2¹ = 20210220119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (20210220131) 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, 111045075 + ... + 111045256.

It is an arithmetic number, because the mean of its divisors is an integer number (3109264648).

Almost surely, 2^20210220121 is an apocalyptic number.

It is an amenable number.

20210220121 is a deficient number, since it is larger than the sum of its proper divisors (4663897063).

20210220121 is a wasteful number, since it uses less digits than its factorization.

20210220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222090351.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20210220121 its reverse (12102201202), we get a palindrome (32312421323).

The spelling of 20210220121 in words is "twenty billion, two hundred ten million, two hundred twenty thousand, one hundred twenty-one".