21301308078 has 16 divisors (see below), whose sum is σ = 43115901696. Its totient is φ = 7014888440.

The previous prime is 21301308047. The next prime is 21301308079. The reversal of 21301308078 is 87080310312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301308079) 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, 21386358 + ... + 21387353.

It is an arithmetic number, because the mean of its divisors is an integer number (2694743856).

Almost surely, 2^21301308078 is an apocalyptic number.

21301308078 is an abundant number, since it is smaller than the sum of its proper divisors (21814593618).

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

21301308078 is a wasteful number, since it uses less digits than its factorization.

21301308078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42773799.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 21301308078 in words is "twenty-one billion, three hundred one million, three hundred eight thousand, seventy-eight".