21145010052 has 12 divisors (see below), whose sum is σ = 49338356816. Its totient is φ = 7048336680.

The previous prime is 21145010039. The next prime is 21145010093. The reversal of 21145010052 is 25001054112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21145010052² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881042074 + ... + 881042097.

Almost surely, 2^21145010052 is an apocalyptic number.

It is an amenable number.

21145010052 is an abundant number, since it is smaller than the sum of its proper divisors (28193346764).

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

21145010052 is a wasteful number, since it uses less digits than its factorization.

21145010052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762084178 (or 1762084176 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 21145010052 its reverse (25001054112), we get a palindrome (46146064164).

The spelling of 21145010052 in words is "twenty-one billion, one hundred forty-five million, ten thousand, fifty-two".