21112220100021 has 8 divisors (see below), whose sum is σ = 28149859406784. Its totient is φ = 14074697096640.

The previous prime is 21112220100007. The next prime is 21112220100061. The reversal of 21112220100021 is 12000102221112.

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

It is not a de Polignac number, because 21112220100021 - 2²³ = 21112211711413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112220100061) 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, 28651396 + ... + 29379021.

It is an arithmetic number, because the mean of its divisors is an integer number (3518732425848).

Almost surely, 2^{21112220100021} is an apocalyptic number.

It is an amenable number.

21112220100021 is a deficient number, since it is larger than the sum of its proper divisors (7037639306763).

21112220100021 is a wasteful number, since it uses less digits than its factorization.

21112220100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58151691.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21112220100021 its reverse (12000102221112), we get a palindrome (33112322321133).

The spelling of 21112220100021 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, one hundred thousand, twenty-one".