72238121 has 2 divisors, whose sum is σ = 72238122. Its totient is φ = 72238120.

The previous prime is 72238109. The next prime is 72238139. The reversal of 72238121 is 12183227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36966400 + 35271721 = 6080^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 72238121 - 2²² = 68043817 is a prime.

It is a super-2 number, since 2×72238121² = 10436692251221282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72238141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36119060 + 36119061.

It is an arithmetic number, because the mean of its divisors is an integer number (36119061).

Almost surely, 2^72238121 is an apocalyptic number.

It is an amenable number.

72238121 is a deficient number, since it is larger than the sum of its proper divisors (1).

72238121 is an equidigital number, since it uses as much as digits as its factorization.

72238121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 72238121 is about 8499.3012065699. The cubic root of 72238121 is about 416.4748818359.

The spelling of 72238121 in words is "seventy-two million, two hundred thirty-eight thousand, one hundred twenty-one".