1377772221 has 8 divisors (see below), whose sum is σ = 2099462464. Its totient is φ = 787298400.

The previous prime is 1377772217. The next prime is 1377772229. The reversal of 1377772221 is 1222777731.

It is a happy number.

1377772221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1377772221 - 2² = 1377772217 is a prime.

It is a super-3 number, since 3×1377772221³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1377772221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377772229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32804080 + ... + 32804121.

It is an arithmetic number, because the mean of its divisors is an integer number (262432808).

Almost surely, 2^1377772221 is an apocalyptic number.

It is an amenable number.

1377772221 is a deficient number, since it is larger than the sum of its proper divisors (721690243).

1377772221 is an equidigital number, since it uses as much as digits as its factorization.

1377772221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65608211.

The product of its digits is 57624, while the sum is 39.

The square root of 1377772221 is about 37118.3542334517. The cubic root of 1377772221 is about 1112.7368604956.

The spelling of 1377772221 in words is "one billion, three hundred seventy-seven million, seven hundred seventy-two thousand, two hundred twenty-one".