21021110011121 has 8 divisors (see below), whose sum is σ = 23078184472704. Its totient is φ = 18988379626320.

The previous prime is 21021110011091. The next prime is 21021110011129. The reversal of 21021110011121 is 12111001112012.

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 21021110011121 - 2²⁶ = 21021042902257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021110011096 and 21021110011105.

It is not an unprimeable number, because it can be changed into a prime (21021110011129) 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, 6086017385 + ... + 6086020838.

It is an arithmetic number, because the mean of its divisors is an integer number (2884773059088).

Almost surely, 2^{21021110011121} is an apocalyptic number.

It is an amenable number.

21021110011121 is a deficient number, since it is larger than the sum of its proper divisors (2057074461583).

21021110011121 is a wasteful number, since it uses less digits than its factorization.

21021110011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172038391.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21021110011121 its reverse (12111001112012), we get a palindrome (33132111123133).

The spelling of 21021110011121 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, eleven thousand, one hundred twenty-one".