21011323442 has 8 divisors (see below), whose sum is σ = 31757573232. Its totient is φ = 10425465700.

The previous prime is 21011323441. The next prime is 21011323471. The reversal of 21011323442 is 24432311012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21011323441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40097684 + ... + 40098207.

It is an arithmetic number, because the mean of its divisors is an integer number (3969696654).

Almost surely, 2^21011323442 is an apocalyptic number.

21011323442 is a deficient number, since it is larger than the sum of its proper divisors (10746249790).

21011323442 is a wasteful number, since it uses less digits than its factorization.

21011323442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80196024.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21011323442 its reverse (24432311012), we get a palindrome (45443634454).

The spelling of 21011323442 in words is "twenty-one billion, eleven million, three hundred twenty-three thousand, four hundred forty-two".