88209421 has 2 divisors, whose sum is σ = 88209422. Its totient is φ = 88209420.

The previous prime is 88209391. The next prime is 88209427. The reversal of 88209421 is 12490288.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72488196 + 15721225 = 8514^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 88209421 - 2¹⁷ = 88078349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88209427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44104710 + 44104711.

It is an arithmetic number, because the mean of its divisors is an integer number (44104711).

Almost surely, 2^88209421 is an apocalyptic number.

It is an amenable number.

88209421 is a deficient number, since it is larger than the sum of its proper divisors (1).

88209421 is an equidigital number, since it uses as much as digits as its factorization.

88209421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 88209421 is about 9391.9870634494. The cubic root of 88209421 is about 445.1485780853.

The spelling of 88209421 in words is "eighty-eight million, two hundred nine thousand, four hundred twenty-one".