21050478 has 24 divisors (see below), whose sum is σ = 46671768. Its totient is φ = 6853392.

The previous prime is 21050473. The next prime is 21050483. The reversal of 21050478 is 87405012.

It is an interprime number because it is at equal distance from previous prime (21050473) and next prime (21050483).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12825 + ... + 14372.

It is an arithmetic number, because the mean of its divisors is an integer number (1944657).

Almost surely, 2^21050478 is an apocalyptic number.

21050478 is an abundant number, since it is smaller than the sum of its proper divisors (25621290).

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

21050478 is a wasteful number, since it uses less digits than its factorization.

21050478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27248 (or 27245 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 21050478 is about 4588.0799905843. The cubic root of 21050478 is about 276.1132962714.

It can be divided in two parts, 21050 and 478, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21050478 in words is "twenty-one million, fifty thousand, four hundred seventy-eight".