5921721 has 16 divisors (see below), whose sum is σ = 9448320. Its totient is φ = 3643920.

The previous prime is 5921717. The next prime is 5921737. The reversal of 5921721 is 1271295.

5921721 is a `hidden beast` number, since 592 + 1 + 72 + 1 = 666.

It is not a de Polignac number, because 5921721 - 2² = 5921717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (5921791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8085 + ... + 8786.

It is an arithmetic number, because the mean of its divisors is an integer number (590520).

Almost surely, 2^5921721 is an apocalyptic number.

It is an amenable number.

5921721 is a deficient number, since it is larger than the sum of its proper divisors (3526599).

5921721 is a wasteful number, since it uses less digits than its factorization.

5921721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16893 (or 16887 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 5921721 is about 2433.4586497411. The cubic root of 5921721 is about 180.9183620930.

The spelling of 5921721 in words is "five million, nine hundred twenty-one thousand, seven hundred twenty-one".