21141378 has 32 divisors (see below), whose sum is σ = 47150400. Its totient is φ = 7021728.

The previous prime is 21141371. The next prime is 21141383. The reversal of 21141378 is 87314112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21141371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19950 + ... + 20982.

It is an arithmetic number, because the mean of its divisors is an integer number (1473450).

Almost surely, 2^21141378 is an apocalyptic number.

21141378 is an abundant number, since it is smaller than the sum of its proper divisors (26009022).

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

21141378 is a wasteful number, since it uses less digits than its factorization.

21141378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1417 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 21141378 is about 4597.9754240318. The cubic root of 21141378 is about 276.5101622879.

The spelling of 21141378 in words is "twenty-one million, one hundred forty-one thousand, three hundred seventy-eight".