87422121 has 6 divisors (see below), whose sum is σ = 126276410. Its totient is φ = 58281408.

The previous prime is 87422107. The next prime is 87422141. The reversal of 87422121 is 12122478.

It can be written as a sum of positive squares in only one way, i.e., 83174400 + 4247721 = 9120^2 + 2061^2 .

It is not a de Polignac number, because 87422121 - 2¹⁰ = 87421097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87422141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4856776 + ... + 4856793.

Almost surely, 2^87422121 is an apocalyptic number.

It is an amenable number.

87422121 is a deficient number, since it is larger than the sum of its proper divisors (38854289).

87422121 is a wasteful number, since it uses less digits than its factorization.

87422121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713575 (or 9713572 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 87422121 is about 9349.9797325984. The cubic root of 87422121 is about 443.8202492500.

Adding to 87422121 its reverse (12122478), we get a palindrome (99544599).

The spelling of 87422121 in words is "eighty-seven million, four hundred twenty-two thousand, one hundred twenty-one".