21455241102 has 48 divisors (see below), whose sum is σ = 49362938352. Its totient is φ = 6711624960.

The previous prime is 21455241079. The next prime is 21455241107. The reversal of 21455241102 is 20114255412.

It is a happy number.

21455241102 is a `hidden beast` number, since 2 + 1 + 4 + 552 + 4 + 1 + 102 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455241107) 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, 5152 + ... + 207212.

It is an arithmetic number, because the mean of its divisors is an integer number (1028394549).

Almost surely, 2^21455241102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21455241102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24681469176).

21455241102 is an abundant number, since it is smaller than the sum of its proper divisors (27907697250).

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

21455241102 is a wasteful number, since it uses less digits than its factorization.

21455241102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202433 (or 202430 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21455241102 its reverse (20114255412), we get a palindrome (41569496514).

The spelling of 21455241102 in words is "twenty-one billion, four hundred fifty-five million, two hundred forty-one thousand, one hundred two".