21140421102 has 48 divisors (see below), whose sum is σ = 47465112240. Its totient is φ = 6792124416.

The previous prime is 21140421097. The next prime is 21140421119. The reversal of 21140421102 is 20112404112.

21140421102 is a `hidden beast` number, since 2 + 1 + 140 + 421 + 102 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 271918 + ... + 340910.

It is an arithmetic number, because the mean of its divisors is an integer number (988856505).

Almost surely, 2^21140421102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21140421102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23732556120).

21140421102 is an abundant number, since it is smaller than the sum of its proper divisors (26324691138).

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

21140421102 is a wasteful number, since it uses less digits than its factorization.

21140421102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69617 (or 69614 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21140421102 its reverse (20112404112), we get a palindrome (41252825214).

The spelling of 21140421102 in words is "twenty-one billion, one hundred forty million, four hundred twenty-one thousand, one hundred two".