21022100101001 has 4 divisors (see below), whose sum is σ = 21218568326352. Its totient is φ = 20825631875652.

The previous prime is 21022100100893. The next prime is 21022100101021. The reversal of 21022100101001 is 10010100122012.

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 21022100101001 - 2¹⁰ = 21022100099977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022100101021) 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, 98234112515 + ... + 98234112728.

It is an arithmetic number, because the mean of its divisors is an integer number (5304642081588).

Almost surely, 2^{21022100101001} is an apocalyptic number.

It is an amenable number.

21022100101001 is a deficient number, since it is larger than the sum of its proper divisors (196468225351).

21022100101001 is a wasteful number, since it uses less digits than its factorization.

21022100101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196468225350.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21022100101001 its reverse (10010100122012), we get a palindrome (31032200223013).

The spelling of 21022100101001 in words is "twenty-one trillion, twenty-two billion, one hundred million, one hundred one thousand, one".