21342121010 has 24 divisors (see below), whose sum is σ = 44687789100. Its totient is φ = 7317298464.

The previous prime is 21342121001. The next prime is 21342121039. The reversal of 21342121010 is 1012124312.

It can be written as a sum of positive squares in 2 ways, for example, as 21336152761 + 5968249 = 146069^2 + 2443^2 .

It is a super-2 number, since 2×21342121010² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21342121010.

It is an unprimeable number.

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, 21777185 + ... + 21778164.

Almost surely, 2^21342121010 is an apocalyptic number.

21342121010 is an abundant number, since it is smaller than the sum of its proper divisors (23345668090).

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

21342121010 is a wasteful number, since it uses less digits than its factorization.

21342121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43555370 (or 43555363 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21342121010 its reverse (1012124312), we get a palindrome (22354245322).

The spelling of 21342121010 in words is "twenty-one billion, three hundred forty-two million, one hundred twenty-one thousand, ten".