220121000021 has 8 divisors (see below), whose sum is σ = 237429072384. Its totient is φ = 202866597360.

The previous prime is 220121000009. The next prime is 220121000027. The reversal of 220121000021 is 120000121022.

It is a happy number.

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 220121000021 - 2³⁴ = 202941130837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220120999966 and 220121000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121000027) 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, 13408901 + ... + 13425306.

It is an arithmetic number, because the mean of its divisors is an integer number (29678634048).

Almost surely, 2^220121000021 is an apocalyptic number.

It is an amenable number.

220121000021 is a deficient number, since it is larger than the sum of its proper divisors (17308072363).

220121000021 is a wasteful number, since it uses less digits than its factorization.

220121000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26834851.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 220121000021 its reverse (120000121022), we get a palindrome (340121121043).

The spelling of 220121000021 in words is "two hundred twenty billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.