7121221124 has 24 divisors (see below), whose sum is σ = 12498054240. Its totient is φ = 3550365504.

The previous prime is 7121221123. The next prime is 7121221127. The reversal of 7121221124 is 4211221217.

It is a self number, because there is not a number n which added to its sum of digits gives 7121221124.

It is not an unprimeable number, because it can be changed into a prime (7121221123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2878352 + ... + 2880824.

It is an arithmetic number, because the mean of its divisors is an integer number (520752260).

Almost surely, 2^7121221124 is an apocalyptic number.

It is an amenable number.

7121221124 is a deficient number, since it is larger than the sum of its proper divisors (5376833116).

7121221124 is a wasteful number, since it uses less digits than its factorization.

7121221124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259 (or 4257 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 7121221124 is about 84387.3279823458. The cubic root of 7121221124 is about 1923.9103181444.

The spelling of 7121221124 in words is "seven billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-four".