21201011012021 has 8 divisors (see below), whose sum is σ = 21312875112000. Its totient is φ = 21089200176000.

The previous prime is 21201011011963. The next prime is 21201011012029. The reversal of 21201011012021 is 12021011010212.

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-21201011012021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201011011987 and 21201011012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201011012029) 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, 12517691 + ... + 14110088.

It is an arithmetic number, because the mean of its divisors is an integer number (2664109389000).

Almost surely, 2^{21201011012021} is an apocalyptic number.

It is an amenable number.

21201011012021 is a deficient number, since it is larger than the sum of its proper divisors (111864099979).

21201011012021 is a wasteful number, since it uses less digits than its factorization.

21201011012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26631979.

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

Adding to 21201011012021 its reverse (12021011010212), we get a palindrome (33222022022233).

The spelling of 21201011012021 in words is "twenty-one trillion, two hundred one billion, eleven million, twelve thousand, twenty-one".