72203026421 has 4 divisors (see below), whose sum is σ = 72204000492. Its totient is φ = 72202052352.

The previous prime is 72203026411. The next prime is 72203026447. The reversal of 72203026421 is 12462030227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12462030227 = 349 ⋅35707823.

It can be written as a sum of positive squares in 2 ways, for example, as 39000720196 + 33202306225 = 197486^2 + 182215^2 .

It is a cyclic number.

It is not a de Polignac number, because 72203026421 - 2³⁴ = 55023157237 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 (72203026411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365786 + ... + 527451.

It is an arithmetic number, because the mean of its divisors is an integer number (18051000123).

Almost surely, 2^72203026421 is an apocalyptic number.

It is an amenable number.

72203026421 is a deficient number, since it is larger than the sum of its proper divisors (974071).

72203026421 is an equidigital number, since it uses as much as digits as its factorization.

72203026421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974070.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 72203026421 its reverse (12462030227), we get a palindrome (84665056648).

The spelling of 72203026421 in words is "seventy-two billion, two hundred three million, twenty-six thousand, four hundred twenty-one".