21021202122101 has 8 divisors (see below), whose sum is σ = 21365776373760. Its totient is φ = 20678801840992.

The previous prime is 21021202122043. The next prime is 21021202122149. The reversal of 21021202122101 is 10122120212012.

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 21021202122101 - 2¹⁰ = 21021202121077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21021202122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021202112101) 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, 543473141 + ... + 543511818.

It is an arithmetic number, because the mean of its divisors is an integer number (2670722046720).

Almost surely, 2^{21021202122101} is an apocalyptic number.

It is an amenable number.

21021202122101 is a deficient number, since it is larger than the sum of its proper divisors (344574251659).

21021202122101 is a wasteful number, since it uses less digits than its factorization.

21021202122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086985275.

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

Adding to 21021202122101 its reverse (10122120212012), we get a palindrome (31143322334113).

The spelling of 21021202122101 in words is "twenty-one trillion, twenty-one billion, two hundred two million, one hundred twenty-two thousand, one hundred one".