21121220020211 has 8 divisors (see below), whose sum is σ = 21656801980944. Its totient is φ = 20590714666080.

The previous prime is 21121220020127. The next prime is 21121220020279. The reversal of 21121220020211 is 11202002212112.

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 21121220020211 - 2²² = 21121215825907 is a prime.

It is a super-2 number, since 2×21121220020211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121220020211.

It is not an unprimeable number, because it can be changed into a prime (21121220020111) 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, 1269143225 + ... + 1269159866.

It is an arithmetic number, because the mean of its divisors is an integer number (2707100247618).

Almost surely, 2^{21121220020211} is an apocalyptic number.

21121220020211 is a deficient number, since it is larger than the sum of its proper divisors (535581960733).

21121220020211 is a wasteful number, since it uses less digits than its factorization.

21121220020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538303301.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121220020211 its reverse (11202002212112), we get a palindrome (32323222232323).

The spelling of 21121220020211 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, twenty thousand, two hundred eleven".