21013313442 has 32 divisors (see below), whose sum is σ = 46016446464. Its totient is φ = 6344168400.

The previous prime is 21013313423. The next prime is 21013313491. The reversal of 21013313442 is 24431331012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569538 + ... + 605309.

It is an arithmetic number, because the mean of its divisors is an integer number (1438013952).

Almost surely, 2^21013313442 is an apocalyptic number.

21013313442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21013313442 is an abundant number, since it is smaller than the sum of its proper divisors (25003133022).

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

21013313442 is a wasteful number, since it uses less digits than its factorization.

21013313442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175134.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21013313442 its reverse (24431331012), we get a palindrome (45444644454).

The spelling of 21013313442 in words is "twenty-one billion, thirteen million, three hundred thirteen thousand, four hundred forty-two".