220021002121 has 8 divisors (see below), whose sum is σ = 229665320640. Its totient is φ = 210383199312.

The previous prime is 220021002077. The next prime is 220021002133. The reversal of 220021002121 is 121200120022.

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 220021002121 - 2¹⁵ = 220020969353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220021002221) 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, 1559850 + ... + 1695043.

It is an arithmetic number, because the mean of its divisors is an integer number (28708165080).

Almost surely, 2^220021002121 is an apocalyptic number.

It is an amenable number.

220021002121 is a deficient number, since it is larger than the sum of its proper divisors (9644318519).

220021002121 is a wasteful number, since it uses less digits than its factorization.

220021002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257855.

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

Adding to 220021002121 its reverse (121200120022), we get a palindrome (341221122143).

The spelling of 220021002121 in words is "two hundred twenty billion, twenty-one million, two thousand, one hundred twenty-one".