21012002101 has 8 divisors (see below), whose sum is σ = 21046708224. Its totient is φ = 20977321680.

The previous prime is 21012002047. The next prime is 21012002117. The reversal of 21012002101 is 10120021012.

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 21012002101 - 2²³ = 21003613493 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 (21012002161) 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, 2231335 + ... + 2240731.

It is an arithmetic number, because the mean of its divisors is an integer number (2630838528).

Almost surely, 2^21012002101 is an apocalyptic number.

It is an amenable number.

21012002101 is a deficient number, since it is larger than the sum of its proper divisors (34706123).

21012002101 is an equidigital number, since it uses as much as digits as its factorization.

21012002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12851.

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

Adding to 21012002101 its reverse (10120021012), we get a palindrome (31132023113).

It can be divided in two parts, 2 and 1012002101, that multiplied together give a palindrome (2024004202).

The spelling of 21012002101 in words is "twenty-one billion, twelve million, two thousand, one hundred one".