21550753345 has 32 divisors (see below), whose sum is σ = 28911467520. Its totient is φ = 15289179840.

The previous prime is 21550753337. The next prime is 21550753403. The reversal of 21550753345 is 54335705512.

It is a happy number.

It is not a de Polignac number, because 21550753345 - 2³ = 21550753337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21550753298 and 21550753307.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351166 + ... + 407944.

It is an arithmetic number, because the mean of its divisors is an integer number (903483360).

Almost surely, 2^21550753345 is an apocalyptic number.

It is an amenable number.

21550753345 is a deficient number, since it is larger than the sum of its proper divisors (7360714175).

21550753345 is a wasteful number, since it uses less digits than its factorization.

21550753345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56965.

The product of its (nonzero) digits is 315000, while the sum is 40.

The spelling of 21550753345 in words is "twenty-one billion, five hundred fifty million, seven hundred fifty-three thousand, three hundred forty-five".