21143234012 has 12 divisors (see below), whose sum is σ = 38609384016. Its totient is φ = 10111981440.

The previous prime is 21143233987. The next prime is 21143234053. The reversal of 21143234012 is 21043234112.

It is a super-2 number, since 2×21143234012² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114908789 + ... + 114908972.

It is an arithmetic number, because the mean of its divisors is an integer number (3217448668).

Almost surely, 2^21143234012 is an apocalyptic number.

It is an amenable number.

21143234012 is a deficient number, since it is larger than the sum of its proper divisors (17466150004).

21143234012 is a wasteful number, since it uses less digits than its factorization.

21143234012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229817788 (or 229817786 counting only the distinct ones).

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

Adding to 21143234012 its reverse (21043234112), we get a palindrome (42186468124).

The spelling of 21143234012 in words is "twenty-one billion, one hundred forty-three million, two hundred thirty-four thousand, twelve".