21077650 has 48 divisors (see below), whose sum is σ = 45041760. Its totient is φ = 7257600.

The previous prime is 21077633. The next prime is 21077659. The reversal of 21077650 is 5677012.

It is a super-3 number, since 3×21077650³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21077659) 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 23 ways as a sum of consecutive naturals, for example, 9442 + ... + 11458.

It is an arithmetic number, because the mean of its divisors is an integer number (938370).

Almost surely, 2^21077650 is an apocalyptic number.

21077650 is an abundant number, since it is smaller than the sum of its proper divisors (23964110).

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

21077650 is a wasteful number, since it uses less digits than its factorization.

21077650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059 (or 2054 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 21077650 is about 4591.0401871471. The cubic root of 21077650 is about 276.2320477267.

The spelling of 21077650 in words is "twenty-one million, seventy-seven thousand, six hundred fifty".