21121212100101 has 8 divisors (see below), whose sum is σ = 28922740893984. Its totient is φ = 13700245686480.

The previous prime is 21121212100099. The next prime is 21121212100181. The reversal of 21121212100101 is 10100121212112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121212100101 - 2¹ = 21121212100099 is a prime.

It is a super-2 number, since 2×21121212100101² (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 (21121212100181) 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, 95140594935 + ... + 95140595156.

It is an arithmetic number, because the mean of its divisors is an integer number (3615342611748).

Almost surely, 2^{21121212100101} is an apocalyptic number.

It is an amenable number.

21121212100101 is a deficient number, since it is larger than the sum of its proper divisors (7801528793883).

21121212100101 is a wasteful number, since it uses less digits than its factorization.

21121212100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190281190131.

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

Adding to 21121212100101 its reverse (10100121212112), we get a palindrome (31221333312213).

The spelling of 21121212100101 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred thousand, one hundred one".