399221210111 has 4 divisors (see below), whose sum is σ = 400034288424. Its totient is φ = 398408131800.

The previous prime is 399221210099. The next prime is 399221210117. The reversal of 399221210111 is 111012122993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399221210111 - 2³⁴ = 382041340927 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 (399221210117) 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, 406538420 + ... + 406539401.

It is an arithmetic number, because the mean of its divisors is an integer number (100008572106).

Almost surely, 2^399221210111 is an apocalyptic number.

399221210111 is a deficient number, since it is larger than the sum of its proper divisors (813078313).

399221210111 is an equidigital number, since it uses as much as digits as its factorization.

399221210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813078312.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 399221210111 in words is "three hundred ninety-nine billion, two hundred twenty-one million, two hundred ten thousand, one hundred eleven".