123770221 has 4 divisors (see below), whose sum is σ = 123797500. Its totient is φ = 123742944.

The previous prime is 123770209. The next prime is 123770249. The reversal of 123770221 is 122077321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122077321 = 233 ⋅523937.

It can be written as a sum of positive squares in 2 ways, for example, as 9066121 + 114704100 = 3011^2 + 10710^2 .

It is a cyclic number.

It is not a de Polignac number, because 123770221 - 2⁵ = 123770189 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 (123770201) 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, 5016 + ... + 16513.

It is an arithmetic number, because the mean of its divisors is an integer number (30949375).

Almost surely, 2^123770221 is an apocalyptic number.

It is an amenable number.

123770221 is a deficient number, since it is larger than the sum of its proper divisors (27279).

123770221 is an equidigital number, since it uses as much as digits as its factorization.

123770221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27278.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 123770221 is about 11125.2065598801. The cubic root of 123770221 is about 498.3548878149.

The spelling of 123770221 in words is "one hundred twenty-three million, seven hundred seventy thousand, two hundred twenty-one".