21117054075 has 48 divisors (see below), whose sum is σ = 37777748736. Its totient is φ = 10346716800.

The previous prime is 21117054073. The next prime is 21117054121. The reversal of 21117054075 is 57045071112.

It is not a de Polignac number, because 21117054075 - 2¹ = 21117054073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21117054073) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 154402 + ... + 257048.

It is an arithmetic number, because the mean of its divisors is an integer number (787036432).

Almost surely, 2^21117054075 is an apocalyptic number.

21117054075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21117054075 is a deficient number, since it is larger than the sum of its proper divisors (16660694661).

21117054075 is a wasteful number, since it uses less digits than its factorization.

21117054075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102884 (or 102879 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 33.

The spelling of 21117054075 in words is "twenty-one billion, one hundred seventeen million, fifty-four thousand, seventy-five".