21121000012101 has 32 divisors (see below), whose sum is σ = 31028329575936. Its totient is φ = 12672763560000.

The previous prime is 21121000012069. The next prime is 21121000012109. The reversal of 21121000012101 is 10121000012112.

It is not a de Polignac number, because 21121000012101 - 2⁵ = 21121000012069 is a prime.

It is a super-2 number, since 2×21121000012101² (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 (21121000012109) 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, 38829330 + ... + 39369516.

It is an arithmetic number, because the mean of its divisors is an integer number (969635299248).

Almost surely, 2^{21121000012101} is an apocalyptic number.

It is an amenable number.

21121000012101 is a deficient number, since it is larger than the sum of its proper divisors (9907329563835).

21121000012101 is a wasteful number, since it uses less digits than its factorization.

21121000012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552033.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21121000012101 its reverse (10121000012112), we get a palindrome (31242000024213).

The spelling of 21121000012101 in words is "twenty-one trillion, one hundred twenty-one billion, twelve thousand, one hundred one".