21070226478 has 48 divisors (see below), whose sum is σ = 49039845120. Its totient is φ = 6017692464.

The previous prime is 21070226449. The next prime is 21070226503. The reversal of 21070226478 is 87462207012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 816075 + ... + 841497.

It is an arithmetic number, because the mean of its divisors is an integer number (1021663440).

Almost surely, 2^21070226478 is an apocalyptic number.

21070226478 is an abundant number, since it is smaller than the sum of its proper divisors (27969618642).

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

21070226478 is a wasteful number, since it uses less digits than its factorization.

21070226478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28261 (or 28254 counting only the distinct ones).

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

The spelling of 21070226478 in words is "twenty-one billion, seventy million, two hundred twenty-six thousand, four hundred seventy-eight".