21022020022121 has 8 divisors (see below), whose sum is σ = 22130144974080. Its totient is φ = 19930072076992.

The previous prime is 21022020022103. The next prime is 21022020022153. The reversal of 21022020022121 is 12122002022012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21022020022121 - 2¹⁴ = 21022020005737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022020022121.

It is not an unprimeable number, because it can be changed into a prime (21022020022181) 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, 4044249041 + ... + 4044254238.

It is an arithmetic number, because the mean of its divisors is an integer number (2766268121760).

Almost surely, 2^{21022020022121} is an apocalyptic number.

It is an amenable number.

21022020022121 is a deficient number, since it is larger than the sum of its proper divisors (1108124951959).

21022020022121 is a wasteful number, since it uses less digits than its factorization.

21022020022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8088503415.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022020022121 its reverse (12122002022012), we get a palindrome (33144022044133).

The spelling of 21022020022121 in words is "twenty-one trillion, twenty-two billion, twenty million, twenty-two thousand, one hundred twenty-one".