21341878 has 4 divisors (see below), whose sum is σ = 32012820. Its totient is φ = 10670938.

The previous prime is 21341867. The next prime is 21341897. The reversal of 21341878 is 87814312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5335468 + ... + 5335471.

It is an arithmetic number, because the mean of its divisors is an integer number (8003205).

Almost surely, 2^21341878 is an apocalyptic number.

21341878 is a deficient number, since it is larger than the sum of its proper divisors (10670942).

21341878 is a wasteful number, since it uses less digits than its factorization.

21341878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10670941.

The product of its digits is 10752, while the sum is 34.

The square root of 21341878 is about 4619.7270482140. The cubic root of 21341878 is about 277.3815331787.

The spelling of 21341878 in words is "twenty-one million, three hundred forty-one thousand, eight hundred seventy-eight".