21340211211 has 16 divisors (see below), whose sum is σ = 34489230720. Its totient is φ = 12933461160.

The previous prime is 21340211201. The next prime is 21340211261. The reversal of 21340211211 is 11211204312.

It is not a de Polignac number, because 21340211211 - 2²¹ = 21338114059 is a prime.

It is a super-2 number, since 2×21340211211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21340211201) 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, 35925985 + ... + 35926578.

It is an arithmetic number, because the mean of its divisors is an integer number (2155576920).

Almost surely, 2^21340211211 is an apocalyptic number.

21340211211 is a deficient number, since it is larger than the sum of its proper divisors (13149019509).

21340211211 is a wasteful number, since it uses less digits than its factorization.

21340211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71852583 (or 71852577 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21340211211 its reverse (11211204312), we get a palindrome (32551415523).

The spelling of 21340211211 in words is "twenty-one billion, three hundred forty million, two hundred eleven thousand, two hundred eleven".