21033242031 has 8 divisors (see below), whose sum is σ = 28044997504. Its totient is φ = 14021823960.

The previous prime is 21033242011. The next prime is 21033242039. The reversal of 21033242031 is 13024233012.

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

It is not a de Polignac number, because 21033242031 - 2²¹ = 21031144879 is a prime.

It is a super-2 number, since 2×21033242031² (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 = 21033241989 and 21033242007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033242039) 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, 175236 + ... + 269766.

It is an arithmetic number, because the mean of its divisors is an integer number (3505624688).

Almost surely, 2^21033242031 is an apocalyptic number.

21033242031 is a deficient number, since it is larger than the sum of its proper divisors (7011755473).

21033242031 is an equidigital number, since it uses as much as digits as its factorization.

21033242031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168701.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21033242031 its reverse (13024233012), we get a palindrome (34057475043).

The spelling of 21033242031 in words is "twenty-one billion, thirty-three million, two hundred forty-two thousand, thirty-one".