2140721 has 8 divisors (see below), whose sum is σ = 2369088. Its totient is φ = 1918000.

The previous prime is 2140681. The next prime is 2140729. The reversal of 2140721 is 1270412.

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 2140721 - 2¹⁸ = 1878577 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2140721.

It is not an unprimeable number, because it can be changed into a prime (2140729) 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, 590 + ... + 2151.

It is an arithmetic number, because the mean of its divisors is an integer number (296136).

2^2140721 is an apocalyptic number.

It is an amenable number.

2140721 is a deficient number, since it is larger than the sum of its proper divisors (228367).

2140721 is a wasteful number, since it uses less digits than its factorization.

2140721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 2140721 is about 1463.1202958062. The cubic root of 2140721 is about 128.8803449493.

The spelling of 2140721 in words is "two million, one hundred forty thousand, seven hundred twenty-one".