21203303331 has 32 divisors (see below), whose sum is σ = 33110000640. Its totient is φ = 11818744704.

The previous prime is 21203303321. The next prime is 21203303377. The reversal of 21203303331 is 13330330212.

It is not a de Polignac number, because 21203303331 - 2¹⁵ = 21203270563 is a prime.

It is a super-2 number, since 2×21203303331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21203303298 and 21203303307.

It is not an unprimeable number, because it can be changed into a prime (21203303321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137490 + ... + 247608.

It is an arithmetic number, because the mean of its divisors is an integer number (1034687520).

Almost surely, 2^21203303331 is an apocalyptic number.

21203303331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21203303331 is a deficient number, since it is larger than the sum of its proper divisors (11906697309).

21203303331 is a wasteful number, since it uses less digits than its factorization.

21203303331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110355.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21203303331 its reverse (13330330212), we get a palindrome (34533633543).

The spelling of 21203303331 in words is "twenty-one billion, two hundred three million, three hundred three thousand, three hundred thirty-one".