10221861 has 16 divisors (see below), whose sum is σ = 14739200. Its totient is φ = 6264000.

The previous prime is 10221853. The next prime is 10221863. The reversal of 10221861 is 16812201.

It is not a de Polignac number, because 10221861 - 2³ = 10221853 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 (10221863) 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, 13236 + ... + 13986.

It is an arithmetic number, because the mean of its divisors is an integer number (921200).

Almost surely, 2^10221861 is an apocalyptic number.

It is an amenable number.

10221861 is a deficient number, since it is larger than the sum of its proper divisors (4517339).

10221861 is a wasteful number, since it uses less digits than its factorization.

10221861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 10221861 is about 3197.1645250127. The cubic root of 10221861 is about 217.0251126550.

The spelling of 10221861 in words is "ten million, two hundred twenty-one thousand, eight hundred sixty-one".