10420921 has 16 divisors (see below), whose sum is σ = 12355200. Its totient is φ = 8604288.

The previous prime is 10420903. The next prime is 10420933. The reversal of 10420921 is 12902401.

10420921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10420921 - 2¹¹ = 10418873 is a prime.

It is a super-3 number, since 3×10420921³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10420901) 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, 26595 + ... + 26983.

It is an arithmetic number, because the mean of its divisors is an integer number (772200).

Almost surely, 2^10420921 is an apocalyptic number.

It is an amenable number.

10420921 is a deficient number, since it is larger than the sum of its proper divisors (1934279).

10420921 is an equidigital number, since it uses as much as digits as its factorization.

10420921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 10420921 is about 3228.1451330447. The cubic root of 10420921 is about 218.4248441572.

It can be divided in two parts, 104 and 20921, that added together give a square (21025 = 145²).

The spelling of 10420921 in words is "ten million, four hundred twenty thousand, nine hundred twenty-one".