21331434201 has 16 divisors (see below), whose sum is σ = 35460046848. Its totient is φ = 11081264400.

The previous prime is 21331434161. The next prime is 21331434227. The reversal of 21331434201 is 10243413312.

It is a happy number.

It is not a de Polignac number, because 21331434201 - 2²⁷ = 21197216473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331434001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46171705 + ... + 46172166.

It is an arithmetic number, because the mean of its divisors is an integer number (2216252928).

Almost surely, 2^21331434201 is an apocalyptic number.

21331434201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21331434201 is a deficient number, since it is larger than the sum of its proper divisors (14128612647).

21331434201 is a wasteful number, since it uses less digits than its factorization.

21331434201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92343892.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21331434201 its reverse (10243413312), we get a palindrome (31574847513).

The spelling of 21331434201 in words is "twenty-one billion, three hundred thirty-one million, four hundred thirty-four thousand, two hundred one".