2147623721 has 8 divisors (see below), whose sum is σ = 2175436800. Its totient is φ = 2119981248.

The previous prime is 2147623717. The next prime is 2147623729. The reversal of 2147623721 is 1273267412.

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

It is a cyclic number.

It is not a de Polignac number, because 2147623721 - 2² = 2147623717 is a prime.

It is a super-2 number, since 2×2147623721² = 9224575294003771682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2147623729) 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, 17216 + ... + 67761.

It is an arithmetic number, because the mean of its divisors is an integer number (271929600).

Almost surely, 2^2147623721 is an apocalyptic number.

It is an amenable number.

2147623721 is a deficient number, since it is larger than the sum of its proper divisors (27813079).

2147623721 is a wasteful number, since it uses less digits than its factorization.

2147623721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85303.

The product of its digits is 28224, while the sum is 35.

The square root of 2147623721 is about 46342.4613178886. The cubic root of 2147623721 is about 1290.1872053695.

The spelling of 2147623721 in words is "two billion, one hundred forty-seven million, six hundred twenty-three thousand, seven hundred twenty-one".