21002021102011 has 8 divisors (see below), whose sum is σ = 21226007064240. Its totient is φ = 20778604355808.

The previous prime is 21002021102009. The next prime is 21002021102047. The reversal of 21002021102011 is 11020112020012.

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 21002021102011 - 2¹ = 21002021102009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002021101982 and 21002021102000.

It is not an unprimeable number, because it can be changed into a prime (21002021102311) 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, 142229821 + ... + 142377406.

It is an arithmetic number, because the mean of its divisors is an integer number (2653250883030).

Almost surely, 2^{21002021102011} is an apocalyptic number.

21002021102011 is a deficient number, since it is larger than the sum of its proper divisors (223985962229).

21002021102011 is a wasteful number, since it uses less digits than its factorization.

21002021102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284608013.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21002021102011 its reverse (11020112020012), we get a palindrome (32022133122023).

The spelling of 21002021102011 in words is "twenty-one trillion, two billion, twenty-one million, one hundred two thousand, eleven".