21010020101 has 8 divisors (see below), whose sum is σ = 24249189504. Its totient is φ = 17830285200.

The previous prime is 21010020091. The next prime is 21010020113. The reversal of 21010020101 is 10102001012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21010020101 - 2¹⁰ = 21010019077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010020131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14857865 + ... + 14859278.

It is an arithmetic number, because the mean of its divisors is an integer number (3031148688).

Almost surely, 2^21010020101 is an apocalyptic number.

It is an amenable number.

21010020101 is a deficient number, since it is larger than the sum of its proper divisors (3239169403).

21010020101 is a wasteful number, since it uses less digits than its factorization.

21010020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29717251.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21010020101 its reverse (10102001012), we get a palindrome (31112021113).

The spelling of 21010020101 in words is "twenty-one billion, ten million, twenty thousand, one hundred one".