221010022000021 has 4 divisors (see below), whose sum is σ = 234010611529452. Its totient is φ = 208009432470592.

The previous prime is 221010021999979. The next prime is 221010022000087. The reversal of 221010022000021 is 120000220010122.

It is a happy number.

221010022000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 150632788295025 + 70377233704996 = 12273255^2 + 8389114^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010022000021 - 2²¹ = 221010019902869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221010021999965 and 221010022000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010022000321) 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, 6500294764690 + ... + 6500294764723.

It is an arithmetic number, because the mean of its divisors is an integer number (58502652882363).

Almost surely, 2^{221010022000021} is an apocalyptic number.

It is an amenable number.

221010022000021 is a deficient number, since it is larger than the sum of its proper divisors (13000589529431).

221010022000021 is a wasteful number, since it uses less digits than its factorization.

221010022000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13000589529430.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221010022000021 its reverse (120000220010122), we get a palindrome (341010242010143).

The spelling of 221010022000021 in words is "two hundred twenty-one trillion, ten billion, twenty-two million, twenty-one", and thus it is an aban number.