21053145042 has 24 divisors (see below), whose sum is σ = 45619413840. Its totient is φ = 7017058680.

The previous prime is 21053145023. The next prime is 21053145097. The reversal of 21053145042 is 24054135012.

It is a junction number, because it is equal to n+sod(n) for n = 21053144997 and 21053145015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167509 + ... + 264887.

It is an arithmetic number, because the mean of its divisors is an integer number (1900808910).

Almost surely, 2^21053145042 is an apocalyptic number.

21053145042 is an abundant number, since it is smaller than the sum of its proper divisors (24566268798).

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

21053145042 is a wasteful number, since it uses less digits than its factorization.

21053145042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109398 (or 109395 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21053145042 in words is "twenty-one billion, fifty-three million, one hundred forty-five thousand, forty-two".