21221412126 has 32 divisors (see below), whose sum is σ = 42776398080. Its totient is φ = 7018425024.

The previous prime is 21221412101. The next prime is 21221412127. The reversal of 21221412126 is 62121412212.

It is a junction number, because it is equal to n+sod(n) for n = 21221412096 and 21221412105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221412127) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 368815 + ... + 422453.

It is an arithmetic number, because the mean of its divisors is an integer number (1336762440).

Almost surely, 2^21221412126 is an apocalyptic number.

21221412126 is an abundant number, since it is smaller than the sum of its proper divisors (21554985954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221412126 is a wasteful number, since it uses less digits than its factorization.

21221412126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54160.

The product of its digits is 768, while the sum is 24.

Adding to 21221412126 its reverse (62121412212), we get a palindrome (83342824338).

The spelling of 21221412126 in words is "twenty-one billion, two hundred twenty-one million, four hundred twelve thousand, one hundred twenty-six".