21021020101 has 8 divisors (see below), whose sum is σ = 22219977600. Its totient is φ = 19831321440.

The previous prime is 21021020099. The next prime is 21021020117. The reversal of 21021020101 is 10102012012.

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

It is not a de Polignac number, because 21021020101 - 2¹ = 21021020099 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 (21021020161) 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, 2310040 + ... + 2319121.

It is an arithmetic number, because the mean of its divisors is an integer number (2777497200).

Almost surely, 2^21021020101 is an apocalyptic number.

It is an amenable number.

21021020101 is a deficient number, since it is larger than the sum of its proper divisors (1198957499).

21021020101 is a wasteful number, since it uses less digits than its factorization.

21021020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629419.

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

Adding to 21021020101 its reverse (10102012012), we get a palindrome (31123032113).

The spelling of 21021020101 in words is "twenty-one billion, twenty-one million, twenty thousand, one hundred one".