21421102410 has 24 divisors (see below), whose sum is σ = 55694866500. Its totient is φ = 5712293952.

The previous prime is 21421102403. The next prime is 21421102411. The reversal of 21421102410 is 1420112412.

21421102410 is a `hidden beast` number, since 2 + 1 + 421 + 1 + 0 + 241 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20254128489 + 1166973921 = 142317^2 + 34161^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21421102411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119006035 + ... + 119006214.

Almost surely, 2^21421102410 is an apocalyptic number.

21421102410 is an abundant number, since it is smaller than the sum of its proper divisors (34273764090).

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

21421102410 is a wasteful number, since it uses less digits than its factorization.

21421102410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238012262 (or 238012259 counting only the distinct ones).

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

Adding to 21421102410 its reverse (1420112412), we get a palindrome (22841214822).

The spelling of 21421102410 in words is "twenty-one billion, four hundred twenty-one million, one hundred two thousand, four hundred ten".