21121111300001 has 4 divisors (see below), whose sum is σ = 21122480415792. Its totient is φ = 21119742184212.

The previous prime is 21121111299949. The next prime is 21121111300007. The reversal of 21121111300001 is 10000311112112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21121111300001 - 2³⁴ = 21103931430817 is a prime.

It is a super-2 number, since 2×21121111300001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121111300007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684534755 + ... + 684565608.

It is an arithmetic number, because the mean of its divisors is an integer number (5280620103948).

Almost surely, 2^{21121111300001} is an apocalyptic number.

It is an amenable number.

21121111300001 is a deficient number, since it is larger than the sum of its proper divisors (1369115791).

21121111300001 is a wasteful number, since it uses less digits than its factorization.

21121111300001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369115790.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21121111300001 its reverse (10000311112112), we get a palindrome (31121422412113).

The spelling of 21121111300001 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, three hundred thousand, one".