21211021210001 has 8 divisors (see below), whose sum is σ = 24242974762944. Its totient is φ = 18179519573520.

The previous prime is 21211021209997. The next prime is 21211021210019. The reversal of 21211021210001 is 10001212011212.

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 21211021210001 - 2² = 21211021209997 is a prime.

It is a super-2 number, since 2×21211021210001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21211021210021) 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, 112878530 + ... + 113066283.

It is an arithmetic number, because the mean of its divisors is an integer number (3030371845368).

Almost surely, 2^{21211021210001} is an apocalyptic number.

It is an amenable number.

21211021210001 is a deficient number, since it is larger than the sum of its proper divisors (3031953552943).

21211021210001 is a wasteful number, since it uses less digits than its factorization.

21211021210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225958231.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211021210001 its reverse (10001212011212), we get a palindrome (31212233221213).

The spelling of 21211021210001 in words is "twenty-one trillion, two hundred eleven billion, twenty-one million, two hundred ten thousand, one".