21555753274 has 16 divisors (see below), whose sum is σ = 35615511360. Its totient is φ = 9702941760.

The previous prime is 21555753269. The next prime is 21555753301. The reversal of 21555753274 is 47235755512.

It is a super-3 number, since 3×21555753274³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4754079 + ... + 4758610.

It is an arithmetic number, because the mean of its divisors is an integer number (2225969460).

Almost surely, 2^21555753274 is an apocalyptic number.

21555753274 is a deficient number, since it is larger than the sum of its proper divisors (14059758086).

21555753274 is a wasteful number, since it uses less digits than its factorization.

21555753274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9512805.

The product of its digits is 1470000, while the sum is 46.

The spelling of 21555753274 in words is "twenty-one billion, five hundred fifty-five million, seven hundred fifty-three thousand, two hundred seventy-four".