72221437293 has 16 divisors (see below), whose sum is σ = 100595367936. Its totient is φ = 46002289520.

The previous prime is 72221437289. The next prime is 72221437303. The reversal of 72221437293 is 39273412227.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72221437293 - 2² = 72221437289 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72221437213) 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, 528813 + ... + 651218.

It is an arithmetic number, because the mean of its divisors is an integer number (6287210496).

Almost surely, 2^72221437293 is an apocalyptic number.

It is an amenable number.

72221437293 is a deficient number, since it is larger than the sum of its proper divisors (28373930643).

72221437293 is a wasteful number, since it uses less digits than its factorization.

72221437293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180944.

The product of its digits is 254016, while the sum is 42.

The spelling of 72221437293 in words is "seventy-two billion, two hundred twenty-one million, four hundred thirty-seven thousand, two hundred ninety-three".