21211412472 has 96 divisors (see below), whose sum is σ = 59343298560. Its totient is φ = 6837480000.

The previous prime is 21211412471. The next prime is 21211412473. The reversal of 21211412472 is 27421411212.

It is an interprime number because it is at equal distance from previous prime (21211412471) and next prime (21211412473).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211412471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4352197 + ... + 4357067.

It is an arithmetic number, because the mean of its divisors is an integer number (618159360).

Almost surely, 2^21211412472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211412472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29671649280).

21211412472 is an abundant number, since it is smaller than the sum of its proper divisors (38131886088).

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

21211412472 is a wasteful number, since it uses less digits than its factorization.

21211412472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6865 (or 6858 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

Adding to 21211412472 its reverse (27421411212), we get a palindrome (48632823684).

The spelling of 21211412472 in words is "twenty-one billion, two hundred eleven million, four hundred twelve thousand, four hundred seventy-two".