21221010033 has 16 divisors (see below), whose sum is σ = 28692350016. Its totient is φ = 13949881920.

The previous prime is 21221010017. The next prime is 21221010077. The reversal of 21221010033 is 33001012212.

It is not a de Polignac number, because 21221010033 - 2⁴ = 21221010017 is a prime.

It is a super-2 number, since 2×21221010033² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221009994 and 21221010021.

It is not an unprimeable number, because it can be changed into a prime (21221015033) 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, 110266 + ... + 233667.

It is an arithmetic number, because the mean of its divisors is an integer number (1793271876).

Almost surely, 2^21221010033 is an apocalyptic number.

It is an amenable number.

21221010033 is a deficient number, since it is larger than the sum of its proper divisors (7471339983).

21221010033 is a wasteful number, since it uses less digits than its factorization.

21221010033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344224.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21221010033 its reverse (33001012212), we get a palindrome (54222022245).

The spelling of 21221010033 in words is "twenty-one billion, two hundred twenty-one million, ten thousand, thirty-three".