21121212022211 has 16 divisors (see below), whose sum is σ = 24415554333888. Its totient is φ = 17896685568000.

The previous prime is 21121212022129. The next prime is 21121212022219. The reversal of 21121212022211 is 11222021212112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121212022211 is a prime.

It is a super-2 number, since 2×21121212022211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121212022219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22849790 + ... + 23756163.

It is an arithmetic number, because the mean of its divisors is an integer number (1525972145868).

Almost surely, 2^{21121212022211} is an apocalyptic number.

21121212022211 is a deficient number, since it is larger than the sum of its proper divisors (3294342311677).

21121212022211 is a wasteful number, since it uses less digits than its factorization.

21121212022211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46606702.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21121212022211 its reverse (11222021212112), we get a palindrome (32343233234323).

The spelling of 21121212022211 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, twenty-two thousand, two hundred eleven".