21420678270 has 16 divisors (see below), whose sum is σ = 51409627920. Its totient is φ = 5712180864.

The previous prime is 21420678259. The next prime is 21420678271. The reversal of 21420678270 is 7287602412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420678271) 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, 357011275 + ... + 357011334.

It is an arithmetic number, because the mean of its divisors is an integer number (3213101745).

Almost surely, 2^21420678270 is an apocalyptic number.

21420678270 is an abundant number, since it is smaller than the sum of its proper divisors (29988949650).

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

21420678270 is a wasteful number, since it uses less digits than its factorization.

21420678270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714022619.

The product of its (nonzero) digits is 75264, while the sum is 39.

The spelling of 21420678270 in words is "twenty-one billion, four hundred twenty million, six hundred seventy-eight thousand, two hundred seventy".