73213721045 has 8 divisors (see below), whose sum is σ = 87884103480. Its totient is φ = 58552551360.

The previous prime is 73213721017. The next prime is 73213721089. The reversal of 73213721045 is 54012731237.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1872379441 + 71341341604 = 43271^2 + 267098^2 .

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

It is not a de Polignac number, because 73213721045 - 2¹² = 73213716949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73213720996 and 73213721014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2285690 + ... + 2317499.

It is an arithmetic number, because the mean of its divisors is an integer number (10985512935).

Almost surely, 2^73213721045 is an apocalyptic number.

It is an amenable number.

73213721045 is a deficient number, since it is larger than the sum of its proper divisors (14670382435).

73213721045 is a wasteful number, since it uses less digits than its factorization.

73213721045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606375.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 73213721045 in words is "seventy-three billion, two hundred thirteen million, seven hundred twenty-one thousand, forty-five".