21142001 has 8 divisors (see below), whose sum is σ = 21591360. Its totient is φ = 20695792.

The previous prime is 21141973. The next prime is 21142021. The reversal of 21142001 is 10024112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142021) 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, 16676 + ... + 17898.

It is an arithmetic number, because the mean of its divisors is an integer number (2698920).

Almost surely, 2^21142001 is an apocalyptic number.

It is an amenable number.

21142001 is a deficient number, since it is larger than the sum of its proper divisors (449359).

21142001 is a wasteful number, since it uses less digits than its factorization.

21142001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21142001 is about 4598.0431707412. The cubic root of 21142001 is about 276.5128783540.

Adding to 21142001 its reverse (10024112), we get a palindrome (31166113).

The spelling of 21142001 in words is "twenty-one million, one hundred forty-two thousand, one".