21153544050 has 24 divisors (see below), whose sum is σ = 52460789616. Its totient is φ = 5640945040.

The previous prime is 21153544043. The next prime is 21153544051. The reversal of 21153544050 is 5044535112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21153543999 and 21153544017.

It is not an unprimeable number, because it can be changed into a prime (21153544051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70511664 + ... + 70511963.

It is an arithmetic number, because the mean of its divisors is an integer number (2185866234).

Almost surely, 2^21153544050 is an apocalyptic number.

21153544050 is an abundant number, since it is smaller than the sum of its proper divisors (31307245566).

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

21153544050 is a wasteful number, since it uses less digits than its factorization.

21153544050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141023642 (or 141023637 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21153544050 in words is "twenty-one billion, one hundred fifty-three million, five hundred forty-four thousand, fifty".