21021011201 has 8 divisors (see below), whose sum is σ = 21427211904. Its totient is φ = 20616797520.

The previous prime is 21021011191. The next prime is 21021011213. The reversal of 21021011201 is 10211012012.

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 21021011201 - 2¹⁰ = 21021010177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021011281) 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, 475385 + ... + 517718.

It is an arithmetic number, because the mean of its divisors is an integer number (2678401488).

Almost surely, 2^21021011201 is an apocalyptic number.

It is an amenable number.

21021011201 is a deficient number, since it is larger than the sum of its proper divisors (406200703).

21021011201 is an equidigital number, since it uses as much as digits as its factorization.

21021011201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993511.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21021011201 its reverse (10211012012), we get a palindrome (31232023213).

The spelling of 21021011201 in words is "twenty-one billion, twenty-one million, eleven thousand, two hundred one".