21110121102 has 48 divisors (see below), whose sum is σ = 49500149760. Its totient is φ = 5983960752.

The previous prime is 21110121101. The next prime is 21110121139. The reversal of 21110121102 is 20112101112.

It is a super-2 number, since 2×21110121102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110121101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 245352 + ... + 320027.

It is an arithmetic number, because the mean of its divisors is an integer number (1031253120).

Almost surely, 2^21110121102 is an apocalyptic number.

21110121102 is an abundant number, since it is smaller than the sum of its proper divisors (28390028658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110121102 is a wasteful number, since it uses less digits than its factorization.

21110121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565525 (or 565518 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110121102 its reverse (20112101112), we get a palindrome (41222222214).

The spelling of 21110121102 in words is "twenty-one billion, one hundred ten million, one hundred twenty-one thousand, one hundred two".