21002210020111 has 16 divisors (see below), whose sum is σ = 21418441329600. Its totient is φ = 20586721978368.

The previous prime is 21002210020091. The next prime is 21002210020123. The reversal of 21002210020111 is 11102001220012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002210020111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002210020091 and 21002210020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002210020151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1080962545 + ... + 1080981973.

It is an arithmetic number, because the mean of its divisors is an integer number (1338652583100).

Almost surely, 2^{21002210020111} is an apocalyptic number.

21002210020111 is a deficient number, since it is larger than the sum of its proper divisors (416231309489).

21002210020111 is a wasteful number, since it uses less digits than its factorization.

21002210020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37458.

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

Adding to 21002210020111 its reverse (11102001220012), we get a palindrome (32104211240123).

The spelling of 21002210020111 in words is "twenty-one trillion, two billion, two hundred ten million, twenty thousand, one hundred eleven".