21012001100121 has 8 divisors (see below), whose sum is σ = 29664001553184. Its totient is φ = 13184000690240.

The previous prime is 21012001100113. The next prime is 21012001100179. The reversal of 21012001100121 is 12100110021012.

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

It is a cyclic number.

It is not a de Polignac number, because 21012001100121 - 2³ = 21012001100113 is a prime.

It is a super-2 number, since 2×21012001100121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012001100097 and 21012001100106.

It is not an unprimeable number, because it can be changed into a prime (21012001100521) 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, 206000010735 + ... + 206000010836.

It is an arithmetic number, because the mean of its divisors is an integer number (3708000194148).

Almost surely, 2^{21012001100121} is an apocalyptic number.

It is an amenable number.

21012001100121 is a deficient number, since it is larger than the sum of its proper divisors (8652000453063).

21012001100121 is a wasteful number, since it uses less digits than its factorization.

21012001100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412000021591.

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

Adding to 21012001100121 its reverse (12100110021012), we get a palindrome (33112111121133).

The spelling of 21012001100121 in words is "twenty-one trillion, twelve billion, one million, one hundred thousand, one hundred twenty-one".