2257220021 has 16 divisors (see below), whose sum is σ = 2632867200. Its totient is φ = 1894995648.

The previous prime is 2257219963. The next prime is 2257220057. The reversal of 2257220021 is 1200227522.

It is not a de Polignac number, because 2257220021 - 2¹⁸ = 2256957877 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 (2257220321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224735 + ... + 234563.

It is an arithmetic number, because the mean of its divisors is an integer number (164554200).

Almost surely, 2^2257220021 is an apocalyptic number.

It is an amenable number.

2257220021 is a deficient number, since it is larger than the sum of its proper divisors (375647179).

2257220021 is an equidigital number, since it uses as much as digits as its factorization.

2257220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10508.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 2257220021 is about 47510.2096501373. The cubic root of 2257220021 is about 1311.7708159578.

Adding to 2257220021 its reverse (1200227522), we get a palindrome (3457447543).

The spelling of 2257220021 in words is "two billion, two hundred fifty-seven million, two hundred twenty thousand, twenty-one".