88121021 has 2 divisors, whose sum is σ = 88121022. Its totient is φ = 88121020.

The previous prime is 88120987. The next prime is 88121029. The reversal of 88121021 is 12012188.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88096996 + 24025 = 9386^2 + 155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88121021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88121029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44060510 + 44060511.

It is an arithmetic number, because the mean of its divisors is an integer number (44060511).

Almost surely, 2^88121021 is an apocalyptic number.

It is an amenable number.

88121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

88121021 is an equidigital number, since it uses as much as digits as its factorization.

88121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 88121021 is about 9387.2797444201. The cubic root of 88121021 is about 444.9998249379. Note that the first 3 decimals are identical.

The spelling of 88121021 in words is "eighty-eight million, one hundred twenty-one thousand, twenty-one".