72222136407421 has 128 divisors (see below), whose sum is σ = 100691716608000. Its totient is φ = 49985820057600.

The previous prime is 72222136407419. The next prime is 72222136407437. The reversal of 72222136407421 is 12470463122227.

It is not a de Polignac number, because 72222136407421 - 2¹ = 72222136407419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222136407401) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5385284206 + ... + 5385297616.

It is an arithmetic number, because the mean of its divisors is an integer number (786654036000).

Almost surely, 2^{72222136407421} is an apocalyptic number.

It is an amenable number.

72222136407421 is a deficient number, since it is larger than the sum of its proper divisors (28469580200579).

72222136407421 is a wasteful number, since it uses less digits than its factorization.

72222136407421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15075.

The product of its (nonzero) digits is 451584, while the sum is 43.

Adding to 72222136407421 its reverse (12470463122227), we get a palindrome (84692599529648).

The spelling of 72222136407421 in words is "seventy-two trillion, two hundred twenty-two billion, one hundred thirty-six million, four hundred seven thousand, four hundred twenty-one".