21403103355 has 12 divisors (see below), whose sum is σ = 37098712560. Its totient is φ = 11414988432.

The previous prime is 21403103347. The next prime is 21403103369. The reversal of 21403103355 is 55330130412.

21403103355 is a `hidden beast` number, since 2 + 14 + 0 + 310 + 335 + 5 = 666.

It is not a de Polignac number, because 21403103355 - 2³ = 21403103347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237812215 + ... + 237812304.

It is an arithmetic number, because the mean of its divisors is an integer number (3091559380).

Almost surely, 2^21403103355 is an apocalyptic number.

21403103355 is a deficient number, since it is larger than the sum of its proper divisors (15695609205).

21403103355 is a wasteful number, since it uses less digits than its factorization.

21403103355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475624530 (or 475624527 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21403103355 its reverse (55330130412), we get a palindrome (76733233767).

The spelling of 21403103355 in words is "twenty-one billion, four hundred three million, one hundred three thousand, three hundred fifty-five".