21428669158 has 8 divisors (see below), whose sum is σ = 34615542528. Its totient is φ = 9890154984.

The previous prime is 21428669153. The next prime is 21428669173. The reversal of 21428669158 is 85196682412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21428669153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412089766 + ... + 412089817.

It is an arithmetic number, because the mean of its divisors is an integer number (4326942816).

Almost surely, 2^21428669158 is an apocalyptic number.

21428669158 is a deficient number, since it is larger than the sum of its proper divisors (13186873370).

21428669158 is a wasteful number, since it uses less digits than its factorization.

21428669158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824179598.

The product of its digits is 1658880, while the sum is 52.

The spelling of 21428669158 in words is "twenty-one billion, four hundred twenty-eight million, six hundred sixty-nine thousand, one hundred fifty-eight".