21278368930 has 32 divisors (see below), whose sum is σ = 47139773184. Its totient is φ = 6734252736.

The previous prime is 21278368921. The next prime is 21278369009. The reversal of 21278368930 is 3986387212.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11690502 + ... + 11692321.

It is an arithmetic number, because the mean of its divisors is an integer number (1473117912).

Almost surely, 2^21278368930 is an apocalyptic number.

21278368930 is an abundant number, since it is smaller than the sum of its proper divisors (25861404254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21278368930 is a wasteful number, since it uses less digits than its factorization.

21278368930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23382850.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 21278368930 in words is "twenty-one billion, two hundred seventy-eight million, three hundred sixty-eight thousand, nine hundred thirty".