21011121332021 has 8 divisors (see below), whose sum is σ = 22117098304800. Its totient is φ = 19905157207440.

The previous prime is 21011121331987. The next prime is 21011121332023. The reversal of 21011121332021 is 12023312111012.

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 21011121332021 - 2⁶ = 21011121331957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011121331984 and 21011121332002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011121332023) 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, 239831 + ... + 6486891.

It is an arithmetic number, because the mean of its divisors is an integer number (2764637288100).

Almost surely, 2^{21011121332021} is an apocalyptic number.

It is an amenable number.

21011121332021 is a deficient number, since it is larger than the sum of its proper divisors (1105976972779).

21011121332021 is a wasteful number, since it uses less digits than its factorization.

21011121332021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6424099.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21011121332021 its reverse (12023312111012), we get a palindrome (33034433443033).

The spelling of 21011121332021 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, three hundred thirty-two thousand, twenty-one".