10221988 has 18 divisors (see below), whose sum is σ = 20809446. Its totient is φ = 4380768.

The previous prime is 10221973. The next prime is 10222001. The reversal of 10221988 is 88912201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10188864 + 33124 = 3192^2 + 182^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25881 + ... + 26272.

Almost surely, 2^10221988 is an apocalyptic number.

It is an amenable number.

10221988 is an abundant number, since it is smaller than the sum of its proper divisors (10587458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10221988 is a wasteful number, since it uses less digits than its factorization.

10221988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52171 (or 52162 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 10221988 is about 3197.1843862999. The cubic root of 10221988 is about 217.0260114501.

The spelling of 10221988 in words is "ten million, two hundred twenty-one thousand, nine hundred eighty-eight".