3905222225221 has 16 divisors (see below), whose sum is σ = 4035634352640. Its totient is φ = 3775089216960.

The previous prime is 3905222225209. The next prime is 3905222225239. The reversal of 3905222225221 is 1225222225093.

It is a cyclic number.

It is not a de Polignac number, because 3905222225221 - 2¹¹ = 3905222223173 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 (3905222625221) 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, 159913350 + ... + 159937768.

It is an arithmetic number, because the mean of its divisors is an integer number (252227147040).

Almost surely, 2^{3905222225221} is an apocalyptic number.

3905222225221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3905222225221 is a deficient number, since it is larger than the sum of its proper divisors (130412127419).

3905222225221 is a wasteful number, since it uses less digits than its factorization.

3905222225221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29916.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 3905222225221 in words is "three trillion, nine hundred five billion, two hundred twenty-two million, two hundred twenty-five thousand, two hundred twenty-one".