21533202122 has 8 divisors (see below), whose sum is σ = 32301788196. Its totient is φ = 10765939392.

The previous prime is 21533202109. The next prime is 21533202137. The reversal of 21533202122 is 22120233512.

It can be written as a sum of positive squares in 2 ways, for example, as 20624119321 + 909082801 = 143611^2 + 30151^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289103 + ... + 355874.

Almost surely, 2^21533202122 is an apocalyptic number.

21533202122 is a deficient number, since it is larger than the sum of its proper divisors (10768586074).

21533202122 is a wasteful number, since it uses less digits than its factorization.

21533202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661672.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21533202122 its reverse (22120233512), we get a palindrome (43653435634).

The spelling of 21533202122 in words is "twenty-one billion, five hundred thirty-three million, two hundred two thousand, one hundred twenty-two".