21143203134 has 16 divisors (see below), whose sum is σ = 42304105872. Its totient is φ = 7044784448.

The previous prime is 21143203091. The next prime is 21143203139. The reversal of 21143203134 is 43130234112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143203139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721929 + ... + 750644.

It is an arithmetic number, because the mean of its divisors is an integer number (2644006617).

Almost surely, 2^21143203134 is an apocalyptic number.

21143203134 is an abundant number, since it is smaller than the sum of its proper divisors (21160902738).

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

21143203134 is a wasteful number, since it uses less digits than its factorization.

21143203134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474971.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21143203134 its reverse (43130234112), we get a palindrome (64273437246).

The spelling of 21143203134 in words is "twenty-one billion, one hundred forty-three million, two hundred three thousand, one hundred thirty-four".