7121215 has 16 divisors (see below), whose sum is σ = 9115200. Its totient is φ = 5322240.

The previous prime is 7121209. The next prime is 7121263. The reversal of 7121215 is 5121217.

It is not a de Polignac number, because 7121215 - 2¹³ = 7113023 is a prime.

7121215 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7121192 and 7121201.

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, 16705 + ... + 17125.

It is an arithmetic number, because the mean of its divisors is an integer number (569700).

Almost surely, 2^7121215 is an apocalyptic number.

7121215 is a deficient number, since it is larger than the sum of its proper divisors (1993985).

7121215 is a wasteful number, since it uses less digits than its factorization.

7121215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642.

The product of its digits is 140, while the sum is 19.

The square root of 7121215 is about 2668.5604733639. The cubic root of 7121215 is about 192.3909766646.

The spelling of 7121215 in words is "seven million, one hundred twenty-one thousand, two hundred fifteen".