21002111111110 has 64 divisors (see below), whose sum is σ = 38237274751104. Its totient is φ = 8304810624000.

The previous prime is 21002111111083. The next prime is 21002111111117. The reversal of 21002111111110 is 1111111120012.

It is a super-2 number, since 2×21002111111110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002111111117) 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, 2587418772 + ... + 2587426888.

It is an arithmetic number, because the mean of its divisors is an integer number (597457417986).

Almost surely, 2^{21002111111110} is an apocalyptic number.

21002111111110 is a deficient number, since it is larger than the sum of its proper divisors (17235163639994).

21002111111110 is a wasteful number, since it uses less digits than its factorization.

21002111111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12289.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21002111111110 its reverse (1111111120012), we get a palindrome (22113222231122).

The spelling of 21002111111110 in words is "twenty-one trillion, two billion, one hundred eleven million, one hundred eleven thousand, one hundred ten".