21420031033 has 8 divisors (see below), whose sum is σ = 22114250496. Its totient is φ = 20726014800.

The previous prime is 21420031001. The next prime is 21420031057. The reversal of 21420031033 is 33013002412.

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 21420031033 - 2⁵ = 21420031001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420031033.

It is not an unprimeable number, because it can be changed into a prime (21420031133) 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, 180135 + ... + 274387.

It is an arithmetic number, because the mean of its divisors is an integer number (2764281312).

Almost surely, 2^21420031033 is an apocalyptic number.

It is an amenable number.

21420031033 is a deficient number, since it is larger than the sum of its proper divisors (694219463).

21420031033 is an equidigital number, since it uses as much as digits as its factorization.

21420031033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101615.

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

Adding to 21420031033 its reverse (33013002412), we get a palindrome (54433033445).

The spelling of 21420031033 in words is "twenty-one billion, four hundred twenty million, thirty-one thousand, thirty-three".