21428654134 has 4 divisors (see below), whose sum is σ = 32142981204. Its totient is φ = 10714327066.

The previous prime is 21428654131. The next prime is 21428654147. The reversal of 21428654134 is 43145682412.

It is a happy number.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21428654131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357163532 + ... + 5357163535.

It is an arithmetic number, because the mean of its divisors is an integer number (8035745301).

Almost surely, 2^21428654134 is an apocalyptic number.

21428654134 is a deficient number, since it is larger than the sum of its proper divisors (10714327070).

21428654134 is a wasteful number, since it uses less digits than its factorization.

21428654134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10714327069.

The product of its digits is 184320, while the sum is 40.

The spelling of 21428654134 in words is "twenty-one billion, four hundred twenty-eight million, six hundred fifty-four thousand, one hundred thirty-four".