10221921 has 12 divisors (see below), whose sum is σ = 14873040. Its totient is φ = 6764760.

The previous prime is 10221919. The next prime is 10221923. The reversal of 10221921 is 12912201.

It is an interprime number because it is at equal distance from previous prime (10221919) and next prime (10221923).

It is not a de Polignac number, because 10221921 - 2¹ = 10221919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10221894 and 10221903.

It is not an unprimeable number, because it can be changed into a prime (10221923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2835 + ... + 5336.

It is an arithmetic number, because the mean of its divisors is an integer number (1239420).

Almost surely, 2^10221921 is an apocalyptic number.

It is an amenable number.

10221921 is a deficient number, since it is larger than the sum of its proper divisors (4651119).

10221921 is a wasteful number, since it uses less digits than its factorization.

10221921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8316 (or 8313 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 10221921 is about 3197.1739083134. The cubic root of 10221921 is about 217.0255372835.

The spelling of 10221921 in words is "ten million, two hundred twenty-one thousand, nine hundred twenty-one".