21274412742 has 96 divisors (see below), whose sum is σ = 51469157376. Its totient is φ = 6296097600.

The previous prime is 21274412729. The next prime is 21274412759. The reversal of 21274412742 is 24721447212.

It is a junction number, because it is equal to n+sod(n) for n = 21274412697 and 21274412706.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 2335617 + ... + 2344707.

It is an arithmetic number, because the mean of its divisors is an integer number (536137056).

Almost surely, 2^21274412742 is an apocalyptic number.

21274412742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21274412742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25734578688).

21274412742 is an abundant number, since it is smaller than the sum of its proper divisors (30194744634).

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

21274412742 is a wasteful number, since it uses less digits than its factorization.

21274412742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9386 (or 9383 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

Adding to 21274412742 its reverse (24721447212), we get a palindrome (45995859954).

The spelling of 21274412742 in words is "twenty-one billion, two hundred seventy-four million, four hundred twelve thousand, seven hundred forty-two".