139011621 has 16 divisors (see below), whose sum is σ = 212428800. Its totient is φ = 79209648.

The previous prime is 139011617. The next prime is 139011629. The reversal of 139011621 is 126110931.

It is not a de Polignac number, because 139011621 - 2² = 139011617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139011591 and 139011600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139011629) 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, 1681 + ... + 16758.

It is an arithmetic number, because the mean of its divisors is an integer number (13276800).

Almost surely, 2^139011621 is an apocalyptic number.

It is an amenable number.

139011621 is a deficient number, since it is larger than the sum of its proper divisors (73417179).

139011621 is a wasteful number, since it uses less digits than its factorization.

139011621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18808.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 139011621 is about 11790.3189524287. The cubic root of 139011621 is about 518.0245822972.

The spelling of 139011621 in words is "one hundred thirty-nine million, eleven thousand, six hundred twenty-one".