21212021001101 has 32 divisors (see below), whose sum is σ = 25357200900096. Its totient is φ = 17362383696000.

The previous prime is 21212021001089. The next prime is 21212021001113. The reversal of 21212021001101 is 10110012021212.

It is an interprime number because it is at equal distance from previous prime (21212021001089) and next prime (21212021001113).

It is a de Polignac number, because none of the positive numbers 2^k-21212021001101 is a prime.

It is a super-2 number, since 2×21212021001101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212021001401) 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, 4591946 + ... + 7969316.

It is an arithmetic number, because the mean of its divisors is an integer number (792412528128).

Almost surely, 2^{21212021001101} is an apocalyptic number.

It is an amenable number.

21212021001101 is a deficient number, since it is larger than the sum of its proper divisors (4145179898995).

21212021001101 is a wasteful number, since it uses less digits than its factorization.

21212021001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377793.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21212021001101 its reverse (10110012021212), we get a palindrome (31322033022313).

The spelling of 21212021001101 in words is "twenty-one trillion, two hundred twelve billion, twenty-one million, one thousand, one hundred one".