21021211021001 has 8 divisors (see below), whose sum is σ = 21080729229120. Its totient is φ = 20961770871888.

The previous prime is 21021211020991. The next prime is 21021211021159. The reversal of 21021211021001 is 10012011212012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021211021001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21021211021301) 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, 18975371 + ... + 20052608.

It is an arithmetic number, because the mean of its divisors is an integer number (2635091153640).

Almost surely, 2^{21021211021001} is an apocalyptic number.

It is an amenable number.

21021211021001 is a deficient number, since it is larger than the sum of its proper divisors (59518208119).

21021211021001 is an equidigital number, since it uses as much as digits as its factorization.

21021211021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39029503.

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

Adding to 21021211021001 its reverse (10012011212012), we get a palindrome (31033222233013).

The spelling of 21021211021001 in words is "twenty-one trillion, twenty-one billion, two hundred eleven million, twenty-one thousand, one".