21001001002201 has 8 divisors (see below), whose sum is σ = 22910320592064. Its totient is φ = 19091704359120.

The previous prime is 21001001002171. The next prime is 21001001002213. The reversal of 21001001002201 is 10220010010012.

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 21001001002201 - 2³¹ = 20998853518553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001001002291) 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, 3794490 + ... + 7510003.

It is an arithmetic number, because the mean of its divisors is an integer number (2863790074008).

Almost surely, 2^{21001001002201} is an apocalyptic number.

It is an amenable number.

21001001002201 is a deficient number, since it is larger than the sum of its proper divisors (1909319589863).

21001001002201 is a wasteful number, since it uses less digits than its factorization.

21001001002201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11473391.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21001001002201 its reverse (10220010010012), we get a palindrome (31221011012213).

The spelling of 21001001002201 in words is "twenty-one trillion, one billion, one million, two thousand, two hundred one".