221000201122021 has 4 divisors (see below), whose sum is σ = 221991233414272. Its totient is φ = 220009168829772.

The previous prime is 221000201122013. The next prime is 221000201122123. The reversal of 221000201122021 is 120221102000122.

It is a happy number.

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 221000201122021 - 2³ = 221000201122013 is a prime.

It is a super-2 number, since 2×221000201122021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221000201121986 and 221000201122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000201120021) 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, 495516145791 + ... + 495516146236.

It is an arithmetic number, because the mean of its divisors is an integer number (55497808353568).

Almost surely, 2^{221000201122021} is an apocalyptic number.

It is an amenable number.

221000201122021 is a deficient number, since it is larger than the sum of its proper divisors (991032292251).

221000201122021 is an equidigital number, since it uses as much as digits as its factorization.

221000201122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991032292250.

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

Adding to 221000201122021 its reverse (120221102000122), we get a palindrome (341221303122143).

The spelling of 221000201122021 in words is "two hundred twenty-one trillion, two hundred one million, one hundred twenty-two thousand, twenty-one".