21134142454 has 16 divisors (see below), whose sum is σ = 32179868208. Its totient is φ = 10407573792.

The previous prime is 21134142451. The next prime is 21134142481. The reversal of 21134142454 is 45424143112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134142451) 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, 1139584 + ... + 1157980.

It is an arithmetic number, because the mean of its divisors is an integer number (2011241763).

Almost surely, 2^21134142454 is an apocalyptic number.

21134142454 is a deficient number, since it is larger than the sum of its proper divisors (11045725754).

21134142454 is a wasteful number, since it uses less digits than its factorization.

21134142454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27039.

The product of its digits is 15360, while the sum is 31.

Adding to 21134142454 its reverse (45424143112), we get a palindrome (66558285566).

The spelling of 21134142454 in words is "twenty-one billion, one hundred thirty-four million, one hundred forty-two thousand, four hundred fifty-four".