21077884 has 6 divisors (see below), whose sum is σ = 36886304. Its totient is φ = 10538940.

The previous prime is 21077873. The next prime is 21077887. The reversal of 21077884 is 48877012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2634732 + ... + 2634739.

Almost surely, 2^21077884 is an apocalyptic number.

It is an amenable number.

21077884 is a deficient number, since it is larger than the sum of its proper divisors (15808420).

21077884 is a wasteful number, since it uses less digits than its factorization.

21077884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5269475 (or 5269473 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 21077884 is about 4591.0656714972. The cubic root of 21077884 is about 276.2330699479.

The spelling of 21077884 in words is "twenty-one million, seventy-seven thousand, eight hundred eighty-four".