22021001002001 has 4 divisors (see below), whose sum is σ = 22021016879652. Its totient is φ = 22020985124352.

The previous prime is 22021001001977. The next prime is 22021001002037. The reversal of 22021001002001 is 10020010012022.

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 14658759912976 + 7362241089025 = 3828676^2 + 2713345^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021001002001 - 2²² = 22020996807697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021001005001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5635736 + ... + 8706521.

It is an arithmetic number, because the mean of its divisors is an integer number (5505254219913).

Almost surely, 2^{22021001002001} is an apocalyptic number.

It is an amenable number.

22021001002001 is a deficient number, since it is larger than the sum of its proper divisors (15877651).

22021001002001 is a wasteful number, since it uses less digits than its factorization.

22021001002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15877650.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22021001002001 its reverse (10020010012022), we get a palindrome (32041011014023).

The spelling of 22021001002001 in words is "twenty-two trillion, twenty-one billion, one million, two thousand, one".