21202110201021 has 32 divisors (see below), whose sum is σ = 29317227134208. Its totient is φ = 13618349337600.

The previous prime is 21202110201001. The next prime is 21202110201031. The reversal of 21202110201021 is 12010201120212.

It is not a de Polignac number, because 21202110201021 - 2¹⁹ = 21202109676733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202110201001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219888421 + ... + 219984821.

It is an arithmetic number, because the mean of its divisors is an integer number (916163347944).

Almost surely, 2^{21202110201021} is an apocalyptic number.

It is an amenable number.

21202110201021 is a deficient number, since it is larger than the sum of its proper divisors (8115116933187).

21202110201021 is a wasteful number, since it uses less digits than its factorization.

21202110201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115781.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21202110201021 its reverse (12010201120212), we get a palindrome (33212311321233).

The spelling of 21202110201021 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, two hundred one thousand, twenty-one".