21428721274 has 8 divisors (see below), whose sum is σ = 32149342368. Its totient is φ = 10712273820.

The previous prime is 21428721269. The next prime is 21428721277. The reversal of 21428721274 is 47212782412.

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

It is not an unprimeable number, because it can be changed into a prime (21428721277) 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, 1030542 + ... + 1051129.

It is an arithmetic number, because the mean of its divisors is an integer number (4018667796).

Almost surely, 2^21428721274 is an apocalyptic number.

21428721274 is a deficient number, since it is larger than the sum of its proper divisors (10720621094).

21428721274 is a wasteful number, since it uses less digits than its factorization.

21428721274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086820.

The product of its digits is 100352, while the sum is 40.

The spelling of 21428721274 in words is "twenty-one billion, four hundred twenty-eight million, seven hundred twenty-one thousand, two hundred seventy-four".