2102021221 has 8 divisors (see below), whose sum is σ = 2196524160. Its totient is φ = 2007777552.

The previous prime is 2102021209. The next prime is 2102021227. The reversal of 2102021221 is 1221202012.

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 2102021221 - 2⁵ = 2102021189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102021227) 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, 48145 + ... + 80758.

It is an arithmetic number, because the mean of its divisors is an integer number (274565520).

Almost surely, 2^2102021221 is an apocalyptic number.

It is an amenable number.

2102021221 is a deficient number, since it is larger than the sum of its proper divisors (94502939).

2102021221 is a wasteful number, since it uses less digits than its factorization.

2102021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129635.

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

The square root of 2102021221 is about 45847.8049747204. The cubic root of 2102021221 is about 1280.9898798339.

Adding to 2102021221 its reverse (1221202012), we get a palindrome (3323223233).

The spelling of 2102021221 in words is "two billion, one hundred two million, twenty-one thousand, two hundred twenty-one".