21212013333 has 8 divisors (see below), whose sum is σ = 32323067968. Its totient is φ = 12121150464.

The previous prime is 21212013323. The next prime is 21212013349. The reversal of 21212013333 is 33331021212.

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

It is not a de Polignac number, because 21212013333 - 2²² = 21207819029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1010095873 = 21212013333 / (2 + 1 + 2 + 1 + 2 + 0 + 1 + 3 + 3 + 3 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212013323) 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, 505047916 + ... + 505047957.

It is an arithmetic number, because the mean of its divisors is an integer number (4040383496).

Almost surely, 2^21212013333 is an apocalyptic number.

It is an amenable number.

21212013333 is a deficient number, since it is larger than the sum of its proper divisors (11111054635).

21212013333 is a wasteful number, since it uses less digits than its factorization.

21212013333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010095883.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21212013333 its reverse (33331021212), we get a palindrome (54543034545).

The spelling of 21212013333 in words is "twenty-one billion, two hundred twelve million, thirteen thousand, three hundred thirty-three".