2221251021 has 12 divisors (see below), whose sum is σ = 3500153280. Its totient is φ = 1346212680.

The previous prime is 2221251001. The next prime is 2221251023. The reversal of 2221251021 is 1201521222.

It is not a de Polignac number, because 2221251021 - 2⁹ = 2221250509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221250985 and 2221251003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221251023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11218341 + ... + 11218538.

It is an arithmetic number, because the mean of its divisors is an integer number (291679440).

Almost surely, 2^2221251021 is an apocalyptic number.

It is an amenable number.

2221251021 is a deficient number, since it is larger than the sum of its proper divisors (1278902259).

2221251021 is a wasteful number, since it uses less digits than its factorization.

2221251021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22436896 (or 22436893 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2221251021 is about 47130.1498088007. The cubic root of 2221251021 is about 1304.7657464763.

Adding to 2221251021 its reverse (1201521222), we get a palindrome (3422772243).

The spelling of 2221251021 in words is "two billion, two hundred twenty-one million, two hundred fifty-one thousand, twenty-one".