21020020010101 has 8 divisors (see below), whose sum is σ = 24260730309504. Its totient is φ = 17838772285200.

The previous prime is 21020020010021. The next prime is 21020020010123. The reversal of 21020020010101 is 10101002002012.

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 21020020010101 - 2³⁵ = 20985660271733 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 (21020020020101) 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, 14865642865 + ... + 14865644278.

It is an arithmetic number, because the mean of its divisors is an integer number (3032591288688).

Almost surely, 2^{21020020010101} is an apocalyptic number.

It is an amenable number.

21020020010101 is a deficient number, since it is larger than the sum of its proper divisors (3240710299403).

21020020010101 is a wasteful number, since it uses less digits than its factorization.

21020020010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29731287251.

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

Adding to 21020020010101 its reverse (10101002002012), we get a palindrome (31121022012113).

The spelling of 21020020010101 in words is "twenty-one trillion, twenty billion, twenty million, ten thousand, one hundred one".