21053550441 has 32 divisors (see below), whose sum is σ = 35021242368. Its totient is φ = 10929680640.

The previous prime is 21053550439. The next prime is 21053550467. The reversal of 21053550441 is 14405535012.

It is not a de Polignac number, because 21053550441 - 2¹ = 21053550439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21053550399 and 21053550408.

It is not an unprimeable number, because it can be changed into a prime (21053550491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329400 + ... + 388086.

It is an arithmetic number, because the mean of its divisors is an integer number (1094413824).

Almost surely, 2^21053550441 is an apocalyptic number.

21053550441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21053550441 is a deficient number, since it is larger than the sum of its proper divisors (13967691927).

21053550441 is a wasteful number, since it uses less digits than its factorization.

21053550441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60261.

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

The spelling of 21053550441 in words is "twenty-one billion, fifty-three million, five hundred fifty thousand, four hundred forty-one".