21001202101 has 8 divisors (see below), whose sum is σ = 22916539008. Its totient is φ = 19086888000.

The previous prime is 21001202099. The next prime is 21001202129. The reversal of 21001202101 is 10120210012.

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 21001202101 - 2¹ = 21001202099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001202171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212445 + ... + 295186.

It is an arithmetic number, because the mean of its divisors is an integer number (2864567376).

Almost surely, 2^21001202101 is an apocalyptic number.

It is an amenable number.

21001202101 is a deficient number, since it is larger than the sum of its proper divisors (1915336907).

21001202101 is a wasteful number, since it uses less digits than its factorization.

21001202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511403.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21001202101 its reverse (10120210012), we get a palindrome (31121412113).

The spelling of 21001202101 in words is "twenty-one billion, one million, two hundred two thousand, one hundred one".