21120678 has 48 divisors (see below), whose sum is σ = 47226816. Its totient is φ = 6819120.

The previous prime is 21120677. The next prime is 21120689. The reversal of 21120678 is 87602112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99993 + ... + 100203.

It is an arithmetic number, because the mean of its divisors is an integer number (983892).

Almost surely, 2^21120678 is an apocalyptic number.

21120678 is an abundant number, since it is smaller than the sum of its proper divisors (26106138).

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

21120678 is a wasteful number, since it uses less digits than its factorization.

21120678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 21120678 is about 4595.7238820451. The cubic root of 21120678 is about 276.4198870393.

The spelling of 21120678 in words is "twenty-one million, one hundred twenty thousand, six hundred seventy-eight".