7223780921 has 16 divisors (see below), whose sum is σ = 8533094400. Its totient is φ = 5984321040.

The previous prime is 7223780869. The next prime is 7223780953. The reversal of 7223780921 is 1290873227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7223780921 is a prime.

It is a super-3 number, since 3×7223780921³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7223780021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149630 + ... + 191928.

It is an arithmetic number, because the mean of its divisors is an integer number (533318400).

Almost surely, 2^7223780921 is an apocalyptic number.

It is an amenable number.

7223780921 is a deficient number, since it is larger than the sum of its proper divisors (1309313479).

7223780921 is a wasteful number, since it uses less digits than its factorization.

7223780921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43124.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 7223780921 is about 84992.8286445392. The cubic root of 7223780921 is about 1933.1023798202.

The spelling of 7223780921 in words is "seven billion, two hundred twenty-three million, seven hundred eighty thousand, nine hundred twenty-one".