22021121220001 has 8 divisors (see below), whose sum is σ = 22576458023784. Its totient is φ = 21466652810880.

The previous prime is 22021121219983. The next prime is 22021121220013. The reversal of 22021121220001 is 10002212112022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6015712763025 + 16005408456976 = 2452695^2 + 4000676^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021121220001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021121220031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217047310 + ... + 217148743.

It is an arithmetic number, because the mean of its divisors is an integer number (2822057252973).

Almost surely, 2^{22021121220001} is an apocalyptic number.

It is an amenable number.

22021121220001 is a deficient number, since it is larger than the sum of its proper divisors (555336803783).

22021121220001 is a wasteful number, since it uses less digits than its factorization.

22021121220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434197331.

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

Adding to 22021121220001 its reverse (10002212112022), we get a palindrome (32023333332023).

The spelling of 22021121220001 in words is "twenty-two trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, one".