19725121389 has 8 divisors (see below), whose sum is σ = 26301325792. Its totient is φ = 13149498960.

The previous prime is 19725121373. The next prime is 19725121469. The reversal of 19725121389 is 98312152791.

It is a happy number.

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

It is not a de Polignac number, because 19725121389 - 2⁴ = 19725121373 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 (19725123389) 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, 59074 + ... + 207219.

It is an arithmetic number, because the mean of its divisors is an integer number (3287665724).

Almost surely, 2^19725121389 is an apocalyptic number.

It is an amenable number.

19725121389 is a deficient number, since it is larger than the sum of its proper divisors (6576204403).

19725121389 is a wasteful number, since it uses less digits than its factorization.

19725121389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290987.

The product of its digits is 272160, while the sum is 48.

The spelling of 19725121389 in words is "nineteen billion, seven hundred twenty-five million, one hundred twenty-one thousand, three hundred eighty-nine".