21234131004 has 12 divisors (see below), whose sum is σ = 49546305704. Its totient is φ = 7078043664.

The previous prime is 21234131003. The next prime is 21234131029. The reversal of 21234131004 is 40013143212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234131003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884755447 + ... + 884755470.

Almost surely, 2^21234131004 is an apocalyptic number.

It is an amenable number.

21234131004 is an abundant number, since it is smaller than the sum of its proper divisors (28312174700).

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

21234131004 is a wasteful number, since it uses less digits than its factorization.

21234131004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769510924 (or 1769510922 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21234131004 its reverse (40013143212), we get a palindrome (61247274216).

The spelling of 21234131004 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-one thousand, four".