3557202221 has 4 divisors (see below), whose sum is σ = 3558000192. Its totient is φ = 3556404252.

The previous prime is 3557202203. The next prime is 3557202239. The reversal of 3557202221 is 1222027553.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1222027553 = 3907 ⋅312779.

It is an interprime number because it is at equal distance from previous prime (3557202203) and next prime (3557202239).

It is a cyclic number.

It is not a de Polignac number, because 3557202221 - 2⁶ = 3557202157 is a prime.

It is a super-3 number, since 3×3557202221³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3557202421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392261 + ... + 401226.

It is an arithmetic number, because the mean of its divisors is an integer number (889500048).

Almost surely, 2^3557202221 is an apocalyptic number.

It is an amenable number.

3557202221 is a deficient number, since it is larger than the sum of its proper divisors (797971).

3557202221 is an equidigital number, since it uses as much as digits as its factorization.

3557202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797970.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 3557202221 is about 59642.2855112042. The cubic root of 3557202221 is about 1526.5212405467.

Adding to 3557202221 its reverse (1222027553), we get a palindrome (4779229774).

The spelling of 3557202221 in words is "three billion, five hundred fifty-seven million, two hundred two thousand, two hundred twenty-one".