21203231134 has 4 divisors (see below), whose sum is σ = 31804846704. Its totient is φ = 10601615566.

The previous prime is 21203231087. The next prime is 21203231167. The reversal of 21203231134 is 43113230212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300807782 + ... + 5300807785.

It is an arithmetic number, because the mean of its divisors is an integer number (7951211676).

Almost surely, 2^21203231134 is an apocalyptic number.

21203231134 is a deficient number, since it is larger than the sum of its proper divisors (10601615570).

21203231134 is a wasteful number, since it uses less digits than its factorization.

21203231134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601615569.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21203231134 its reverse (43113230212), we get a palindrome (64316461346).

The spelling of 21203231134 in words is "twenty-one billion, two hundred three million, two hundred thirty-one thousand, one hundred thirty-four".