21233220031 has 8 divisors (see below), whose sum is σ = 22550161104. Its totient is φ = 19923826560.

The previous prime is 21233219999. The next prime is 21233220037. The reversal of 21233220031 is 13002233212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21233220031 - 2⁵ = 21233219999 is a prime.

It is a super-2 number, since 2×21233220031² (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 = 21233219990 and 21233220008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233220037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1881100 + ... + 1892353.

It is an arithmetic number, because the mean of its divisors is an integer number (2818770138).

Almost surely, 2^21233220031 is an apocalyptic number.

21233220031 is a deficient number, since it is larger than the sum of its proper divisors (1316941073).

21233220031 is a wasteful number, since it uses less digits than its factorization.

21233220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773801.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21233220031 its reverse (13002233212), we get a palindrome (34235453243).

The spelling of 21233220031 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty thousand, thirty-one".