21211002101001 has 4 divisors (see below), whose sum is σ = 28281336134672. Its totient is φ = 14140668067332.

The previous prime is 21211002100987. The next prime is 21211002101017. The reversal of 21211002101001 is 10010120011212.

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 not a de Polignac number, because 21211002101001 - 2⁹ = 21211002100489 is a prime.

It is a super-2 number, since 2×21211002101001² (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 (21211002103001) 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, 3535167016831 + ... + 3535167016836.

It is an arithmetic number, because the mean of its divisors is an integer number (7070334033668).

Almost surely, 2^{21211002101001} is an apocalyptic number.

It is an amenable number.

21211002101001 is a deficient number, since it is larger than the sum of its proper divisors (7070334033671).

21211002101001 is an equidigital number, since it uses as much as digits as its factorization.

21211002101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070334033670.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211002101001 its reverse (10010120011212), we get a palindrome (31221122112213).

The spelling of 21211002101001 in words is "twenty-one trillion, two hundred eleven billion, two million, one hundred one thousand, one".