2102020211221 has 8 divisors (see below), whose sum is σ = 2424760297920. Its totient is φ = 1784892995808.

The previous prime is 2102020211209. The next prime is 2102020211233. The reversal of 2102020211221 is 1221120202012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2102020211209) and next prime (2102020211233).

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-2102020211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102020211195 and 2102020211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102020221221) 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, 1403217016 + ... + 1403218513.

It is an arithmetic number, because the mean of its divisors is an integer number (303095037240).

Almost surely, 2^{2102020211221} is an apocalyptic number.

It is an amenable number.

2102020211221 is a deficient number, since it is larger than the sum of its proper divisors (322740086699).

2102020211221 is a wasteful number, since it uses less digits than its factorization.

2102020211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806435643.

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

Adding to 2102020211221 its reverse (1221120202012), we get a palindrome (3323140413233).

The spelling of 2102020211221 in words is "two trillion, one hundred two billion, twenty million, two hundred eleven thousand, two hundred twenty-one".