2016147247921 has 3 divisors (see below), whose sum is σ = 2016148667833. Its totient is φ = 2016145828010.

The previous prime is 2016147247903. The next prime is 2016147247949. The reversal of 2016147247921 is 1297427416102.

It is a happy number.

The square root of 2016147247921 is 1419911.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2016147247921 - 2⁵ = 2016147247889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2016147247901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 709956 + ... + 2129866.

Almost surely, 2^{2016147247921} is an apocalyptic number.

2016147247921 is the 1419911-st square number.

2016147247921 is the 709956-th centered octagonal number.

It is an amenable number.

2016147247921 is a deficient number, since it is larger than the sum of its proper divisors (1419912).

2016147247921 is an frugal number, since it uses more digits than its factorization.

2016147247921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839822 (or 1419911 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 2016147247921 in words is "two trillion, sixteen billion, one hundred forty-seven million, two hundred forty-seven thousand, nine hundred twenty-one".