7122040621 has 4 divisors (see below), whose sum is σ = 7124249500. Its totient is φ = 7119831744.

The previous prime is 7122040619. The next prime is 7122040637. The reversal of 7122040621 is 1260402217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1260402217 = 28027 ⋅44971.

It can be written as a sum of positive squares in 2 ways, for example, as 4532655625 + 2589384996 = 67325^2 + 50886^2 .

It is a cyclic number.

It is not a de Polignac number, because 7122040621 - 2¹ = 7122040619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7122040691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099596 + ... + 1106053.

It is an arithmetic number, because the mean of its divisors is an integer number (1781062375).

Almost surely, 2^7122040621 is an apocalyptic number.

It is an amenable number.

7122040621 is a deficient number, since it is larger than the sum of its proper divisors (2208879).

7122040621 is a wasteful number, since it uses less digits than its factorization.

7122040621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208878.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 7122040621 is about 84392.1834117355. The cubic root of 7122040621 is about 1923.9841153313.

Adding to 7122040621 its reverse (1260402217), we get a palindrome (8382442838).

The spelling of 7122040621 in words is "seven billion, one hundred twenty-two million, forty thousand, six hundred twenty-one".