47899019621 has 4 divisors (see below), whose sum is σ = 47916716832. Its totient is φ = 47881322412.

The previous prime is 47899019593. The next prime is 47899019639. The reversal of 47899019621 is 12691099874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12691099874 = 2 ⋅6345549937.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47899019621 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 (47899019671) 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, 8844545 + ... + 8849958.

It is an arithmetic number, because the mean of its divisors is an integer number (11979179208).

Almost surely, 2^47899019621 is an apocalyptic number.

It is an amenable number.

47899019621 is a deficient number, since it is larger than the sum of its proper divisors (17697211).

47899019621 is a wasteful number, since it uses less digits than its factorization.

47899019621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17697210.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 47899019621 in words is "forty-seven billion, eight hundred ninety-nine million, nineteen thousand, six hundred twenty-one".