21011222020211 has 8 divisors (see below), whose sum is σ = 22407227886960. Its totient is φ = 19632999667968.

The previous prime is 21011222020189. The next prime is 21011222020231. The reversal of 21011222020211 is 11202022211012.

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 21011222020211 - 2⁶ = 21011222020147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 21011222020211.

It is not an unprimeable number, because it can be changed into a prime (21011222020231) 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, 4445876186 + ... + 4445880911.

It is an arithmetic number, because the mean of its divisors is an integer number (2800903485870).

Almost surely, 2^{21011222020211} is an apocalyptic number.

21011222020211 is a deficient number, since it is larger than the sum of its proper divisors (1396005866749).

21011222020211 is a wasteful number, since it uses less digits than its factorization.

21011222020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8891757253.

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

Adding to 21011222020211 its reverse (11202022211012), we get a palindrome (32213244231223).

The spelling of 21011222020211 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, twenty thousand, two hundred eleven".