7211421 has 12 divisors (see below), whose sum is σ = 11904672. Its totient is φ = 4120776.

The previous prime is 7211381. The next prime is 7211429. The reversal of 7211421 is 1241127.

It is not a de Polignac number, because 7211421 - 2⁹ = 7210909 is a prime.

7211421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7211394 and 7211403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7211429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57171 + ... + 57296.

It is an arithmetic number, because the mean of its divisors is an integer number (992056).

Almost surely, 2^7211421 is an apocalyptic number.

It is an amenable number.

7211421 is a deficient number, since it is larger than the sum of its proper divisors (4693251).

7211421 is a wasteful number, since it uses less digits than its factorization.

7211421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114480 (or 114477 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 7211421 is about 2685.4089074106. The cubic root of 7211421 is about 193.1999234854.

Adding to 7211421 its reverse (1241127), we get a palindrome (8452548).

The spelling of 7211421 in words is "seven million, two hundred eleven thousand, four hundred twenty-one".