21000022221201 has 4 divisors (see below), whose sum is σ = 28000029628272. Its totient is φ = 14000014814132.

The previous prime is 21000022221197. The next prime is 21000022221247. The reversal of 21000022221201 is 10212222000012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21000022221201 - 2² = 21000022221197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000022221001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500003703531 + ... + 3500003703536.

It is an arithmetic number, because the mean of its divisors is an integer number (7000007407068).

Almost surely, 2^{21000022221201} is an apocalyptic number.

It is an amenable number.

21000022221201 is a deficient number, since it is larger than the sum of its proper divisors (7000007407071).

21000022221201 is an equidigital number, since it uses as much as digits as its factorization.

21000022221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000007407070.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21000022221201 its reverse (10212222000012), we get a palindrome (31212244221213).

The spelling of 21000022221201 in words is "twenty-one trillion, twenty-two million, two hundred twenty-one thousand, two hundred one".