7237881721 has 8 divisors (see below), whose sum is σ = 8272412864. Its totient is φ = 6203487600.

The previous prime is 7237881713. The next prime is 7237881737. The reversal of 7237881721 is 1271887327.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7237881721 - 2³ = 7237881713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7237881751) 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, 134146 + ... + 180196.

It is an arithmetic number, because the mean of its divisors is an integer number (1034051608).

Almost surely, 2^7237881721 is an apocalyptic number.

It is an amenable number.

7237881721 is a deficient number, since it is larger than the sum of its proper divisors (1034531143).

7237881721 is a wasteful number, since it uses less digits than its factorization.

7237881721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68511.

The product of its digits is 263424, while the sum is 46.

The square root of 7237881721 is about 85075.7410840482. The cubic root of 7237881721 is about 1934.3593657628.

The spelling of 7237881721 in words is "seven billion, two hundred thirty-seven million, eight hundred eighty-one thousand, seven hundred twenty-one".