21212011102101 has 32 divisors (see below), whose sum is σ = 28823458245120. Its totient is φ = 13874320075200.

The previous prime is 21212011102091. The next prime is 21212011102103. The reversal of 21212011102101 is 10120111021212.

It is a happy number.

It is not a de Polignac number, because 21212011102101 - 2⁷ = 21212011101973 is a prime.

It is a super-2 number, since 2×21212011102101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212011102103) 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, 11298546 + ... + 13041516.

It is an arithmetic number, because the mean of its divisors is an integer number (900733070160).

Almost surely, 2^{21212011102101} is an apocalyptic number.

It is an amenable number.

21212011102101 is a deficient number, since it is larger than the sum of its proper divisors (7611447143019).

21212011102101 is a wasteful number, since it uses less digits than its factorization.

21212011102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743457.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21212011102101 its reverse (10120111021212), we get a palindrome (31332122123313).

The spelling of 21212011102101 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one hundred two thousand, one hundred one".