2101021021221 has 32 divisors (see below), whose sum is σ = 2862379296000. Its totient is φ = 1370419015680.

The previous prime is 2101021021213. The next prime is 2101021021277. The reversal of 2101021021221 is 1221201201012.

It is not a de Polignac number, because 2101021021221 - 2³ = 2101021021213 is a prime.

It is a super-2 number, since 2×2101021021221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2101021021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101021028221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206442885 + ... + 206453061.

It is an arithmetic number, because the mean of its divisors is an integer number (89449353000).

Almost surely, 2^{2101021021221} is an apocalyptic number.

It is an amenable number.

2101021021221 is a deficient number, since it is larger than the sum of its proper divisors (761358274779).

2101021021221 is a wasteful number, since it uses less digits than its factorization.

2101021021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16109.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2101021021221 its reverse (1221201201012), we get a palindrome (3322222222233).

The spelling of 2101021021221 in words is "two trillion, one hundred one billion, twenty-one million, twenty-one thousand, two hundred twenty-one".