821087122 has 8 divisors (see below), whose sum is σ = 1245469500. Its totient is φ = 405930624.

The previous prime is 821087119. The next prime is 821087153. The reversal of 821087122 is 221780128.

It can be written as a sum of positive squares in 2 ways, for example, as 781258401 + 39828721 = 27951^2 + 6311^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2306247 + ... + 2306602.

Almost surely, 2^821087122 is an apocalyptic number.

821087122 is a deficient number, since it is larger than the sum of its proper divisors (424382378).

821087122 is a wasteful number, since it uses less digits than its factorization.

821087122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612940.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 821087122 is about 28654.6178128413. The cubic root of 821087122 is about 936.4036119724.

The spelling of 821087122 in words is "eight hundred twenty-one million, eighty-seven thousand, one hundred twenty-two".