139022121 has 8 divisors (see below), whose sum is σ = 211843264. Its totient is φ = 79441200.

The previous prime is 139022089. The next prime is 139022129. The reversal of 139022121 is 121220931.

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

It is not a de Polignac number, because 139022121 - 2⁵ = 139022089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 6620101 = 139022121 / (1 + 3 + 9 + 0 + 2 + 2 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139022129) 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, 3310030 + ... + 3310071.

It is an arithmetic number, because the mean of its divisors is an integer number (26480408).

Almost surely, 2^139022121 is an apocalyptic number.

It is an amenable number.

139022121 is a deficient number, since it is larger than the sum of its proper divisors (72821143).

139022121 is an equidigital number, since it uses as much as digits as its factorization.

139022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6620111.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 139022121 is about 11790.7642245955. The cubic root of 139022121 is about 518.0376246628.

The spelling of 139022121 in words is "one hundred thirty-nine million, twenty-two thousand, one hundred twenty-one".