21033003078 has 64 divisors (see below), whose sum is σ = 49222080000. Its totient is φ = 6639021792.

The previous prime is 21033003077. The next prime is 21033003107. The reversal of 21033003078 is 87030033012.

21033003078 is a `hidden beast` number, since 21 + 0 + 330 + 0 + 307 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033003077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3893023 + ... + 3898421.

It is an arithmetic number, because the mean of its divisors is an integer number (769095000).

Almost surely, 2^21033003078 is an apocalyptic number.

21033003078 is an abundant number, since it is smaller than the sum of its proper divisors (28189076922).

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

21033003078 is a wasteful number, since it uses less digits than its factorization.

21033003078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9226 (or 9220 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

It can be divided in two parts, 2103300 and 3078, that added together give a triangular number (2106378 = T₂₀₅₂).

The spelling of 21033003078 in words is "twenty-one billion, thirty-three million, three thousand, seventy-eight".