20103021 has 12 divisors (see below), whose sum is σ = 29144700. Its totient is φ = 13352640.

The previous prime is 20102983. The next prime is 20103047. The reversal of 20103021 is 12030102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11634921 + 8468100 = 3411^2 + 2910^2 .

It is not a de Polignac number, because 20103021 - 2¹⁰ = 20101997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20102994 and 20103012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103071) 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, 1446 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (2428725).

Almost surely, 2^20103021 is an apocalyptic number.

It is an amenable number.

20103021 is a deficient number, since it is larger than the sum of its proper divisors (9041679).

20103021 is a wasteful number, since it uses less digits than its factorization.

20103021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8236 (or 8233 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20103021 is about 4483.6392584596. The cubic root of 20103021 is about 271.9070337205.

Adding to 20103021 its reverse (12030102), we get a palindrome (32133123).

It can be divided in two parts, 20 and 103021, that added together give a square (103041 = 321²).

The spelling of 20103021 in words is "twenty million, one hundred three thousand, twenty-one".