21077140 has 24 divisors (see below), whose sum is σ = 50585472. Its totient is φ = 7226400.

The previous prime is 21077129. The next prime is 21077167. The reversal of 21077140 is 4177012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75136 + ... + 75415.

It is an arithmetic number, because the mean of its divisors is an integer number (2107728).

Almost surely, 2^21077140 is an apocalyptic number.

21077140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21077140 is an abundant number, since it is smaller than the sum of its proper divisors (29508332).

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

21077140 is a wasteful number, since it uses less digits than its factorization.

21077140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150567 (or 150565 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21077140 is about 4590.9846438428. The cubic root of 21077140 is about 276.2298197826.

The spelling of 21077140 in words is "twenty-one million, seventy-seven thousand, one hundred forty".