20100021222121 has 8 divisors (see below), whose sum is σ = 20365871470560. Its totient is φ = 19834734814752.

The previous prime is 20100021222103. The next prime is 20100021222137. The reversal of 20100021222121 is 12122212000102.

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 20100021222121 - 2²⁵ = 20099987667689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100021222095 and 20100021222104.

It is not an unprimeable number, because it can be changed into a prime (20100021222221) 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, 140888500 + ... + 141031093.

It is an arithmetic number, because the mean of its divisors is an integer number (2545733933820).

Almost surely, 2^{20100021222121} is an apocalyptic number.

It is an amenable number.

20100021222121 is a deficient number, since it is larger than the sum of its proper divisors (265850248439).

20100021222121 is an equidigital number, since it uses as much as digits as its factorization.

20100021222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281920535.

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

Adding to 20100021222121 its reverse (12122212000102), we get a palindrome (32222233222223).

The spelling of 20100021222121 in words is "twenty trillion, one hundred billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".