21035140 has 48 divisors (see below), whose sum is σ = 50746752. Its totient is φ = 7174656.

The previous prime is 21035123. The next prime is 21035149. The reversal of 21035140 is 4153012.

It is a super-2 number, since 2×21035140² = 884954229639200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21035149) 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, 48364 + ... + 48796.

It is an arithmetic number, because the mean of its divisors is an integer number (1057224).

Almost surely, 2^21035140 is an apocalyptic number.

21035140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21035140 is an abundant number, since it is smaller than the sum of its proper divisors (29711612).

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

21035140 is a wasteful number, since it uses less digits than its factorization.

21035140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21035140 is about 4586.4081807009. The cubic root of 21035140 is about 276.0462185429.

Adding to 21035140 its reverse (4153012), we get a palindrome (25188152).

The spelling of 21035140 in words is "twenty-one million, thirty-five thousand, one hundred forty".