7133721 has 24 divisors (see below), whose sum is σ = 11484864. Its totient is φ = 3857760.

The previous prime is 7133719. The next prime is 7133729. The reversal of 7133721 is 1273317.

It is not a de Polignac number, because 7133721 - 2¹ = 7133719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7133691 and 7133700.

It is not an unprimeable number, because it can be changed into a prime (7133729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7111 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (478536).

Almost surely, 2^7133721 is an apocalyptic number.

It is an amenable number.

7133721 is a deficient number, since it is larger than the sum of its proper divisors (4351143).

7133721 is a wasteful number, since it uses less digits than its factorization.

7133721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989 (or 970 counting only the distinct ones).

The product of its digits is 882, while the sum is 24.

The square root of 7133721 is about 2670.9026564066. The cubic root of 7133721 is about 192.5035339768.

The spelling of 7133721 in words is "seven million, one hundred thirty-three thousand, seven hundred twenty-one".