21035442 has 16 divisors (see below), whose sum is σ = 42181632. Its totient is φ = 6993360.

The previous prime is 21035431. The next prime is 21035449. The reversal of 21035442 is 24453012.

It is not an unprimeable number, because it can be changed into a prime (21035449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2034 + ... + 6797.

It is an arithmetic number, because the mean of its divisors is an integer number (2636352).

Almost surely, 2^21035442 is an apocalyptic number.

21035442 is an abundant number, since it is smaller than the sum of its proper divisors (21146190).

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

21035442 is a wasteful number, since it uses less digits than its factorization.

21035442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9233.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21035442 is about 4586.4411039498. The cubic root of 21035442 is about 276.0475395952.

Adding to 21035442 its reverse (24453012), we get a palindrome (45488454).

The spelling of 21035442 in words is "twenty-one million, thirty-five thousand, four hundred forty-two".