87422021 has 16 divisors (see below), whose sum is σ = 94617600. Its totient is φ = 80511408.

The previous prime is 87422017. The next prime is 87422051. The reversal of 87422021 is 12022478.

It is a cyclic number.

It is not a de Polignac number, because 87422021 - 2² = 87422017 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 (87422051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198920 + ... + 199358.

It is an arithmetic number, because the mean of its divisors is an integer number (5913600).

Almost surely, 2^87422021 is an apocalyptic number.

It is an amenable number.

87422021 is a deficient number, since it is larger than the sum of its proper divisors (7195579).

87422021 is a wasteful number, since it uses less digits than its factorization.

87422021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 87422021 is about 9349.9743849917. The cubic root of 87422021 is about 443.8200800249.

Adding to 87422021 its reverse (12022478), we get a palindrome (99444499).

The spelling of 87422021 in words is "eighty-seven million, four hundred twenty-two thousand, twenty-one".