21887038 has 4 divisors (see below), whose sum is σ = 32830560. Its totient is φ = 10943518.

The previous prime is 21886999. The next prime is 21887081. The reversal of 21887038 is 83078812.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21886988 and 21887006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5471758 + ... + 5471761.

It is an arithmetic number, because the mean of its divisors is an integer number (8207640).

Almost surely, 2^21887038 is an apocalyptic number.

21887038 is a deficient number, since it is larger than the sum of its proper divisors (10943522).

21887038 is a wasteful number, since it uses less digits than its factorization.

21887038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10943521.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 21887038 is about 4678.3584727979. The cubic root of 21887038 is about 279.7235281220.

The spelling of 21887038 in words is "twenty-one million, eight hundred eighty-seven thousand, thirty-eight".