21311240234 has 32 divisors (see below), whose sum is σ = 33422146560. Its totient is φ = 10183118400.

The previous prime is 21311240233. The next prime is 21311240261. The reversal of 21311240234 is 43204211312.

It is a super-2 number, since 2×21311240234² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21311240233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 991352 + ... + 1012620.

It is an arithmetic number, because the mean of its divisors is an integer number (1044442080).

Almost surely, 2^21311240234 is an apocalyptic number.

21311240234 is a deficient number, since it is larger than the sum of its proper divisors (12110906326).

21311240234 is a wasteful number, since it uses less digits than its factorization.

21311240234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21566.

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

Adding to 21311240234 its reverse (43204211312), we get a palindrome (64515451546).

The spelling of 21311240234 in words is "twenty-one billion, three hundred eleven million, two hundred forty thousand, two hundred thirty-four".