21420414134 has 16 divisors (see below), whose sum is σ = 36722591136. Its totient is φ = 9179707200.

The previous prime is 21420414133. The next prime is 21420414139. The reversal of 21420414134 is 43141402412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420414133) 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, 493844 + ... + 535464.

It is an arithmetic number, because the mean of its divisors is an integer number (2295161946).

Almost surely, 2^21420414134 is an apocalyptic number.

21420414134 is a deficient number, since it is larger than the sum of its proper divisors (15302177002).

21420414134 is a wasteful number, since it uses less digits than its factorization.

21420414134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78391.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21420414134 its reverse (43141402412), we get a palindrome (64561816546).

The spelling of 21420414134 in words is "twenty-one billion, four hundred twenty million, four hundred fourteen thousand, one hundred thirty-four".