21211345704 has 64 divisors (see below), whose sum is σ = 55835712000. Its totient is φ = 6696354240.

The previous prime is 21211345691. The next prime is 21211345711. The reversal of 21211345704 is 40754311212.

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, 2992837 + ... + 2999915.

It is an arithmetic number, because the mean of its divisors is an integer number (872433000).

Almost surely, 2^21211345704 is an apocalyptic number.

21211345704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21211345704 is an abundant number, since it is smaller than the sum of its proper divisors (34624366296).

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

21211345704 is a wasteful number, since it uses less digits than its factorization.

21211345704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13678 (or 13674 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

Adding to 21211345704 its reverse (40754311212), we get a palindrome (61965656916).

The spelling of 21211345704 in words is "twenty-one billion, two hundred eleven million, three hundred forty-five thousand, seven hundred four".