21211311000001 has 4 divisors (see below), whose sum is σ = 21211327739952. Its totient is φ = 21211294260052.

The previous prime is 21211310999959. The next prime is 21211311000023. The reversal of 21211311000001 is 10000011311212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21211311000001 - 2¹¹ = 21211310997953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211311006001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6298411 + ... + 9060496.

It is an arithmetic number, because the mean of its divisors is an integer number (5302831934988).

Almost surely, 2^{21211311000001} is an apocalyptic number.

It is an amenable number.

21211311000001 is a deficient number, since it is larger than the sum of its proper divisors (16739951).

21211311000001 is a wasteful number, since it uses less digits than its factorization.

21211311000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16739950.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21211311000001 its reverse (10000011311212), we get a palindrome (31211322311213).

The spelling of 21211311000001 in words is "twenty-one trillion, two hundred eleven billion, three hundred eleven million, one", and thus it is an aban number.