10220021 has 4 divisors (see below), whose sum is σ = 11680032. Its totient is φ = 8760012.

The previous prime is 10220011. The next prime is 10220033. The reversal of 10220021 is 12002201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12002201 = 29 ⋅413869.

It is a cyclic number.

It is not a de Polignac number, because 10220021 - 2¹⁸ = 9957877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10219990 and 10220008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10220011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729995 + ... + 730008.

It is an arithmetic number, because the mean of its divisors is an integer number (2920008).

Almost surely, 2^10220021 is an apocalyptic number.

It is an amenable number.

10220021 is a deficient number, since it is larger than the sum of its proper divisors (1460011).

10220021 is an equidigital number, since it uses as much as digits as its factorization.

10220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460010.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 10220021 is about 3196.8767570865. The cubic root of 10220021 is about 217.0120899067.

Adding to 10220021 its reverse (12002201), we get a palindrome (22222222).

The spelling of 10220021 in words is "ten million, two hundred twenty thousand, twenty-one".