21021210022201 has 8 divisors (see below), whose sum is σ = 21037962401280. Its totient is φ = 21004458218832.

The previous prime is 21021210022177. The next prime is 21021210022297. The reversal of 21021210022201 is 10222001212012.

It is a happy number.

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-21021210022201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021210022601) 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, 101115880 + ... + 101323558.

It is an arithmetic number, because the mean of its divisors is an integer number (2629745300160).

Almost surely, 2^{21021210022201} is an apocalyptic number.

It is an amenable number.

21021210022201 is a deficient number, since it is larger than the sum of its proper divisors (16752379079).

21021210022201 is a wasteful number, since it uses less digits than its factorization.

21021210022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287855.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021210022201 its reverse (10222001212012), we get a palindrome (31243211234213).

The spelling of 21021210022201 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, twenty-two thousand, two hundred one".