21141040 has 20 divisors (see below), whose sum is σ = 49153104. Its totient is φ = 8456384.

The previous prime is 21141037. The next prime is 21141041. The reversal of 21141040 is 4014112.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 21141040.

It is not an unprimeable number, because it can be changed into a prime (21141041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132052 + ... + 132211.

Almost surely, 2^21141040 is an apocalyptic number.

21141040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21141040 is an abundant number, since it is smaller than the sum of its proper divisors (28012064).

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

21141040 is a wasteful number, since it uses less digits than its factorization.

21141040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264276 (or 264270 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21141040 is about 4597.9386685775. The cubic root of 21141040 is about 276.5086887017.

Adding to 21141040 its reverse (4014112), we get a palindrome (25155152).

The spelling of 21141040 in words is "twenty-one million, one hundred forty-one thousand, forty".