87921122 has 4 divisors (see below), whose sum is σ = 131881686. Its totient is φ = 43960560.

The previous prime is 87921121. The next prime is 87921131. The reversal of 87921122 is 22112978.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48846121 + 39075001 = 6989^2 + 6251^2 .

It is not an unprimeable number, because it can be changed into a prime (87921121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21980279 + ... + 21980282.

Almost surely, 2^87921122 is an apocalyptic number.

87921122 is a deficient number, since it is larger than the sum of its proper divisors (43960564).

87921122 is a wasteful number, since it uses less digits than its factorization.

87921122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43960563.

The product of its digits is 4032, while the sum is 32.

The square root of 87921122 is about 9376.6263655965. The cubic root of 87921122 is about 444.6630820982.

The spelling of 87921122 in words is "eighty-seven million, nine hundred twenty-one thousand, one hundred twenty-two".