21022012021201 has 4 divisors (see below), whose sum is σ = 21023810476900. Its totient is φ = 21020213565504.

The previous prime is 21022012021187. The next prime is 21022012021211. The reversal of 21022012021201 is 10212021022012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18422774814976 + 2599237206225 = 4292176^2 + 1612215^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022012021201 - 2³³ = 21013422086609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022012021211) 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, 899210316 + ... + 899233693.

It is an arithmetic number, because the mean of its divisors is an integer number (5255952619225).

Almost surely, 2^{21022012021201} is an apocalyptic number.

It is an amenable number.

21022012021201 is a deficient number, since it is larger than the sum of its proper divisors (1798455699).

21022012021201 is a wasteful number, since it uses less digits than its factorization.

21022012021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798455698.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21022012021201 its reverse (10212021022012), we get a palindrome (31234033043213).

The spelling of 21022012021201 in words is "twenty-one trillion, twenty-two billion, twelve million, twenty-one thousand, two hundred one".