21221310022101 has 64 divisors (see below), whose sum is σ = 35957702707200. Its totient is φ = 12117204937728.

The previous prime is 21221310022061. The next prime is 21221310022109. The reversal of 21221310022101 is 10122001312212.

21221310022101 is a `hidden beast` number, since 212 + 21 + 310 + 0 + 22 + 101 = 666.

It is not a de Polignac number, because 21221310022101 - 2⁶ = 21221310022037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221310022109) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1924480750 + ... + 1924491776.

It is an arithmetic number, because the mean of its divisors is an integer number (561839104800).

Almost surely, 2^{21221310022101} is an apocalyptic number.

21221310022101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21221310022101 is a deficient number, since it is larger than the sum of its proper divisors (14736392685099).

21221310022101 is a wasteful number, since it uses less digits than its factorization.

21221310022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17895 (or 17889 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21221310022101 its reverse (10122001312212), we get a palindrome (31343311334313).

The spelling of 21221310022101 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred ten million, twenty-two thousand, one hundred one".