21201211022021 has 8 divisors (see below), whose sum is σ = 21229002443520. Its totient is φ = 21173424807808.

The previous prime is 21201211021997. The next prime is 21201211022111. The reversal of 21201211022021 is 12022011210212.

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 21201211022021 - 2⁴² = 16803164510917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201211022921) 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, 6880085 + ... + 9473013.

It is an arithmetic number, because the mean of its divisors is an integer number (2653625305440).

Almost surely, 2^{21201211022021} is an apocalyptic number.

It is an amenable number.

21201211022021 is a deficient number, since it is larger than the sum of its proper divisors (27791421499).

21201211022021 is an equidigital number, since it uses as much as digits as its factorization.

21201211022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603643.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201211022021 its reverse (12022011210212), we get a palindrome (33223222232233).

The spelling of 21201211022021 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, twenty-two thousand, twenty-one".