21084671478 has 32 divisors (see below), whose sum is σ = 45439785216. Its totient is φ = 6483784608.

The previous prime is 21084671453. The next prime is 21084671501. The reversal of 21084671478 is 87417648012.

It is a congruent 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, 55951 + ... + 212837.

It is an arithmetic number, because the mean of its divisors is an integer number (1419993288).

Almost surely, 2^21084671478 is an apocalyptic number.

21084671478 is an abundant number, since it is smaller than the sum of its proper divisors (24355113738).

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

21084671478 is a wasteful number, since it uses less digits than its factorization.

21084671478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158628.

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 21084671478 in words is "twenty-one billion, eighty-four million, six hundred seventy-one thousand, four hundred seventy-eight".