21035142 has 12 divisors (see below), whose sum is σ = 45576180. Its totient is φ = 7011708.

The previous prime is 21035123. The next prime is 21035149. The reversal of 21035142 is 24153012.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1168619 = 21035142 / (2 + 1 + 0 + 3 + 5 + 1 + 4 + 2).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 584292 + ... + 584327.

It is an arithmetic number, because the mean of its divisors is an integer number (3798015).

Almost surely, 2^21035142 is an apocalyptic number.

21035142 is an abundant number, since it is smaller than the sum of its proper divisors (24541038).

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

21035142 is a wasteful number, since it uses less digits than its factorization.

21035142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168627 (or 1168624 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21035142 is about 4586.4083987364. The cubic root of 21035142 is about 276.0462272916.

Adding to 21035142 its reverse (24153012), we get a palindrome (45188154).

The spelling of 21035142 in words is "twenty-one million, thirty-five thousand, one hundred forty-two".