21010010001001 has 8 divisors (see below), whose sum is σ = 24522321703680. Its totient is φ = 17625418723968.

The previous prime is 21010010000981. The next prime is 21010010001011. The reversal of 21010010001001 is 10010001001012.

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 21010010001001 - 2¹³ = 21010009992809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010010001011) 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, 31930106056 + ... + 31930106713.

It is an arithmetic number, because the mean of its divisors is an integer number (3065290212960).

Almost surely, 2^{21010010001001} is an apocalyptic number.

It is an amenable number.

21010010001001 is a deficient number, since it is larger than the sum of its proper divisors (3512311702679).

21010010001001 is an equidigital number, since it uses as much as digits as its factorization.

21010010001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63860212823.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21010010001001 its reverse (10010001001012), we get a palindrome (31020011002013).

The spelling of 21010010001001 in words is "twenty-one trillion, ten billion, ten million, one thousand, one".