21344100234 has 16 divisors (see below), whose sum is σ = 44544209472. Its totient is φ = 6805365248.

The previous prime is 21344100223. The next prime is 21344100241. The reversal of 21344100234 is 43200144312.

It is a super-2 number, since 2×21344100234² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77333559 + ... + 77333834.

It is an arithmetic number, because the mean of its divisors is an integer number (2784013092).

Almost surely, 2^21344100234 is an apocalyptic number.

21344100234 is an abundant number, since it is smaller than the sum of its proper divisors (23200109238).

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

21344100234 is a wasteful number, since it uses less digits than its factorization.

21344100234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154667421.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21344100234 its reverse (43200144312), we get a palindrome (64544244546).

The spelling of 21344100234 in words is "twenty-one billion, three hundred forty-four million, one hundred thousand, two hundred thirty-four".