21101202101221 has 8 divisors (see below), whose sum is σ = 23092109902944. Its totient is φ = 19122397083120.

The previous prime is 21101202101201. The next prime is 21101202101261. The reversal of 21101202101221 is 12210120210112.

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-21101202101221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101202101195 and 21101202101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101202101201) 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, 3025692255 + ... + 3025699228.

It is an arithmetic number, because the mean of its divisors is an integer number (2886513737868).

Almost surely, 2^{21101202101221} is an apocalyptic number.

It is an amenable number.

21101202101221 is a deficient number, since it is larger than the sum of its proper divisors (1990907801723).

21101202101221 is a wasteful number, since it uses less digits than its factorization.

21101202101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6051391811.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21101202101221 its reverse (12210120210112), we get a palindrome (33311322311333).

The spelling of 21101202101221 in words is "twenty-one trillion, one hundred one billion, two hundred two million, one hundred one thousand, two hundred twenty-one".