21144004134 has 32 divisors (see below), whose sum is σ = 46140675840. Its totient is φ = 6406120800.

The previous prime is 21144004087. The next prime is 21144004157. The reversal of 21144004134 is 43140044112.

It is a congruent number.

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, 385399 + ... + 436829.

It is an arithmetic number, because the mean of its divisors is an integer number (1441896120).

Almost surely, 2^21144004134 is an apocalyptic number.

21144004134 is an abundant number, since it is smaller than the sum of its proper divisors (24996671706).

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

21144004134 is a wasteful number, since it uses less digits than its factorization.

21144004134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57676.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21144004134 its reverse (43140044112), we get a palindrome (64284048246).

The spelling of 21144004134 in words is "twenty-one billion, one hundred forty-four million, four thousand, one hundred thirty-four".