21078542200 has 24 divisors (see below), whose sum is σ = 49007611080. Its totient is φ = 8431416800.

The previous prime is 21078542197. The next prime is 21078542227. The reversal of 21078542200 is 224587012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52696156 + ... + 52696555.

It is an arithmetic number, because the mean of its divisors is an integer number (2041983795).

Almost surely, 2^21078542200 is an apocalyptic number.

21078542200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21078542200 is an abundant number, since it is smaller than the sum of its proper divisors (27929068880).

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

21078542200 is a wasteful number, since it uses less digits than its factorization.

21078542200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105392727 (or 105392718 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The spelling of 21078542200 in words is "twenty-one billion, seventy-eight million, five hundred forty-two thousand, two hundred".