21020020100011 has 32 divisors (see below), whose sum is σ = 22874342400000. Its totient is φ = 19250996919840.

The previous prime is 21020020099927. The next prime is 21020020100059. The reversal of 21020020100011 is 11000102002012.

It is a cyclic number.

It is not a de Polignac number, because 21020020100011 - 2²⁷ = 21019885882283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020021100011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 370492516 + ... + 370549246.

It is an arithmetic number, because the mean of its divisors is an integer number (714823200000).

Almost surely, 2^{21020020100011} is an apocalyptic number.

21020020100011 is a deficient number, since it is larger than the sum of its proper divisors (1854322299989).

21020020100011 is a wasteful number, since it uses less digits than its factorization.

21020020100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61879.

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

Adding to 21020020100011 its reverse (11000102002012), we get a palindrome (32020122102023).

The spelling of 21020020100011 in words is "twenty-one trillion, twenty billion, twenty million, one hundred thousand, eleven".