21002210002121 has 8 divisors (see below), whose sum is σ = 21013739172864. Its totient is φ = 20990681618400.

The previous prime is 21002210002069. The next prime is 21002210002133. The reversal of 21002210002121 is 12120001220012.

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-21002210002121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002210002096 and 21002210002105.

It is not an unprimeable number, because it can be changed into a prime (21002210002421) 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, 57867200 + ... + 58229006.

It is an arithmetic number, because the mean of its divisors is an integer number (2626717396608).

Almost surely, 2^{21002210002121} is an apocalyptic number.

It is an amenable number.

21002210002121 is a deficient number, since it is larger than the sum of its proper divisors (11529170743).

21002210002121 is a wasteful number, since it uses less digits than its factorization.

21002210002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393511.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002210002121 its reverse (12120001220012), we get a palindrome (33122211222133).

The spelling of 21002210002121 in words is "twenty-one trillion, two billion, two hundred ten million, two thousand, one hundred twenty-one".