21042021001 has 8 divisors (see below), whose sum is σ = 21829952000. Its totient is φ = 20260912320.

The previous prime is 21042020983. The next prime is 21042021023. The reversal of 21042021001 is 10012024012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21042021001 - 2³¹ = 18894537353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21042024001) 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, 1699296 + ... + 1711633.

It is an arithmetic number, because the mean of its divisors is an integer number (2728744000).

Almost surely, 2^21042021001 is an apocalyptic number.

It is an amenable number.

21042021001 is a deficient number, since it is larger than the sum of its proper divisors (787930999).

21042021001 is a wasteful number, since it uses less digits than its factorization.

21042021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3411159.

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

Adding to 21042021001 its reverse (10012024012), we get a palindrome (31054045013).

The spelling of 21042021001 in words is "twenty-one billion, forty-two million, twenty-one thousand, one".