21021021201 has 8 divisors (see below), whose sum is σ = 28093060224. Its totient is φ = 13981498160.

The previous prime is 21021021199. The next prime is 21021021269. The reversal of 21021021201 is 10212012012.

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 21021021201 - 2¹ = 21021021199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021021401) 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, 8127486 + ... + 8130071.

It is an arithmetic number, because the mean of its divisors is an integer number (3511632528).

Almost surely, 2^21021021201 is an apocalyptic number.

It is an amenable number.

21021021201 is a deficient number, since it is larger than the sum of its proper divisors (7072039023).

21021021201 is a wasteful number, since it uses less digits than its factorization.

21021021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16257991.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021021201 its reverse (10212012012), we get a palindrome (31233033213).

The spelling of 21021021201 in words is "twenty-one billion, twenty-one million, twenty-one thousand, two hundred one".