21353522355 has 24 divisors (see below), whose sum is σ = 40377570480. Its totient is φ = 10353222720.

The previous prime is 21353522287. The next prime is 21353522369. The reversal of 21353522355 is 55322535312.

21353522355 is a `hidden beast` number, since 21 + 353 + 52 + 235 + 5 = 666.

It is not a de Polignac number, because 21353522355 - 2⁹ = 21353521843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21568720 + ... + 21569709.

It is an arithmetic number, because the mean of its divisors is an integer number (1682398770).

Almost surely, 2^21353522355 is an apocalyptic number.

21353522355 is a deficient number, since it is larger than the sum of its proper divisors (19024048125).

21353522355 is a wasteful number, since it uses less digits than its factorization.

21353522355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43138451 (or 43138448 counting only the distinct ones).

The product of its digits is 135000, while the sum is 36.

The spelling of 21353522355 in words is "twenty-one billion, three hundred fifty-three million, five hundred twenty-two thousand, three hundred fifty-five".