21455133033 has 16 divisors (see below), whose sum is σ = 31606540416. Its totient is φ = 12876737280.

The previous prime is 21455133031. The next prime is 21455133103. The reversal of 21455133033 is 33033155412.

It is not a de Polignac number, because 21455133033 - 2¹ = 21455133031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21455133031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9144238 + ... + 9146583.

It is an arithmetic number, because the mean of its divisors is an integer number (1975408776).

Almost surely, 2^21455133033 is an apocalyptic number.

21455133033 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21455133033 is a deficient number, since it is larger than the sum of its proper divisors (10151407383).

21455133033 is a wasteful number, since it uses less digits than its factorization.

21455133033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18290864.

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 21455133033 its reverse (33033155412), we get a palindrome (54488288445).

The spelling of 21455133033 in words is "twenty-one billion, four hundred fifty-five million, one hundred thirty-three thousand, thirty-three".