20100021203 has 4 divisors (see below), whose sum is σ = 20156010480. Its totient is φ = 20044031928.

The previous prime is 20100021197. The next prime is 20100021217. The reversal of 20100021203 is 30212000102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20100021203 - 2³² = 15805053907 is a prime.

It is a super-2 number, since 2×20100021203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20100021703) 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, 27994100 + ... + 27994817.

It is an arithmetic number, because the mean of its divisors is an integer number (5039002620).

Almost surely, 2^20100021203 is an apocalyptic number.

20100021203 is a deficient number, since it is larger than the sum of its proper divisors (55989277).

20100021203 is an equidigital number, since it uses as much as digits as its factorization.

20100021203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55989276.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20100021203 its reverse (30212000102), we get a palindrome (50312021305).

The spelling of 20100021203 in words is "twenty billion, one hundred million, twenty-one thousand, two hundred three".