21203323031 has 4 divisors (see below), whose sum is σ = 23130897864. Its totient is φ = 19275748200.

The previous prime is 21203323021. The next prime is 21203323039. The reversal of 21203323031 is 13032330212.

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 21203323031 - 2¹⁴ = 21203306647 is a prime.

It is a super-2 number, since 2×21203323031² (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 = 21203322994 and 21203323012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203323039) 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, 963787400 + ... + 963787421.

It is an arithmetic number, because the mean of its divisors is an integer number (5782724466).

Almost surely, 2^21203323031 is an apocalyptic number.

21203323031 is a deficient number, since it is larger than the sum of its proper divisors (1927574833).

21203323031 is a wasteful number, since it uses less digits than its factorization.

21203323031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927574832.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21203323031 its reverse (13032330212), we get a palindrome (34235653243).

The spelling of 21203323031 in words is "twenty-one billion, two hundred three million, three hundred twenty-three thousand, thirty-one".