7121005 has 16 divisors (see below), whose sum is σ = 8812800. Its totient is φ = 5521600.

The previous prime is 7120999. The next prime is 7121021. The reversal of 7121005 is 5001217.

It is not a de Polignac number, because 7121005 - 2¹⁷ = 6989933 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7121005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29676 + ... + 29914.

It is an arithmetic number, because the mean of its divisors is an integer number (550800).

Almost surely, 2^7121005 is an apocalyptic number.

It is an amenable number.

7121005 is a deficient number, since it is larger than the sum of its proper divisors (1691795).

7121005 is a wasteful number, since it uses less digits than its factorization.

7121005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 7121005 is about 2668.5211260172. The cubic root of 7121005 is about 192.3890854844.

The spelling of 7121005 in words is "seven million, one hundred twenty-one thousand, five".