21143240034 has 32 divisors (see below), whose sum is σ = 51170196096. Its totient is φ = 5685576960.

The previous prime is 21143240029. The next prime is 21143240087. The reversal of 21143240034 is 43004234112.

It is a junction number, because it is equal to n+sod(n) for n = 21143239986 and 21143240013.

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, 14805477 + ... + 14806904.

It is an arithmetic number, because the mean of its divisors is an integer number (1599068628).

Almost surely, 2^21143240034 is an apocalyptic number.

21143240034 is an abundant number, since it is smaller than the sum of its proper divisors (30026956062).

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

21143240034 is a wasteful number, since it uses less digits than its factorization.

21143240034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29612410.

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

Adding to 21143240034 its reverse (43004234112), we get a palindrome (64147474146).

The spelling of 21143240034 in words is "twenty-one billion, one hundred forty-three million, two hundred forty thousand, thirty-four".