21061343152 has 20 divisors (see below), whose sum is σ = 40917552736. Its totient is φ = 10501974720.

The previous prime is 21061343131. The next prime is 21061343161. The reversal of 21061343152 is 25134316012.

It is a self number, because there is not a number n which added to its sum of digits gives 21061343152.

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, 1787499 + ... + 1799242.

Almost surely, 2^21061343152 is an apocalyptic number.

It is an amenable number.

21061343152 is a deficient number, since it is larger than the sum of its proper divisors (19856209584).

21061343152 is a wasteful number, since it uses less digits than its factorization.

21061343152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587116 (or 3587110 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21061343152 its reverse (25134316012), we get a palindrome (46195659164).

The spelling of 21061343152 in words is "twenty-one billion, sixty-one million, three hundred forty-three thousand, one hundred fifty-two".