21264212742 has 64 divisors (see below), whose sum is σ = 43306721280. Its totient is φ = 6959990016.

The previous prime is 21264212737. The next prime is 21264212743. The reversal of 21264212742 is 24721246212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264212743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46529778 + ... + 46530234.

It is an arithmetic number, because the mean of its divisors is an integer number (676667520).

Almost surely, 2^21264212742 is an apocalyptic number.

21264212742 is an abundant number, since it is smaller than the sum of its proper divisors (22042508538).

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

21264212742 is a wasteful number, since it uses less digits than its factorization.

21264212742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085.

The product of its digits is 21504, while the sum is 33.

Adding to 21264212742 its reverse (24721246212), we get a palindrome (45985458954).

The spelling of 21264212742 in words is "twenty-one billion, two hundred sixty-four million, two hundred twelve thousand, seven hundred forty-two".