20203010021 has 4 divisors (see below), whose sum is σ = 20504547552. Its totient is φ = 19901472492.

The previous prime is 20203009999. The next prime is 20203010033. The reversal of 20203010021 is 12001030202.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 20203010021 - 2²⁶ = 20135901157 is a prime.

It is a super-2 number, since 2×20203010021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20203009984 and 20203010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203013021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150768665 + ... + 150768798.

It is an arithmetic number, because the mean of its divisors is an integer number (5126136888).

Almost surely, 2^20203010021 is an apocalyptic number.

It is an amenable number.

20203010021 is a deficient number, since it is larger than the sum of its proper divisors (301537531).

20203010021 is an equidigital number, since it uses as much as digits as its factorization.

20203010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301537530.

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

Adding to 20203010021 its reverse (12001030202), we get a palindrome (32204040223).

The spelling of 20203010021 in words is "twenty billion, two hundred three million, ten thousand, twenty-one".