21254555754 has 24 divisors (see below), whose sum is σ = 46682383332. Its totient is φ = 6987798720.

The previous prime is 21254555741. The next prime is 21254555767. The reversal of 21254555754 is 45755545212.

21254555754 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 45 + 557 + 54 = 666.

It is an interprime number because it is at equal distance from previous prime (21254555741) and next prime (21254555767).

It can be written as a sum of positive squares in 2 ways, for example, as 19804088529 + 1450467225 = 140727^2 + 38085^2 .

It is a super-2 number, since 2×21254555754² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8086417 + ... + 8089044.

Almost surely, 2^21254555754 is an apocalyptic number.

21254555754 is an abundant number, since it is smaller than the sum of its proper divisors (25427827578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21254555754 is a wasteful number, since it uses less digits than its factorization.

21254555754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16175542 (or 16175539 counting only the distinct ones).

The product of its digits is 1400000, while the sum is 45.

The spelling of 21254555754 in words is "twenty-one billion, two hundred fifty-four million, five hundred fifty-five thousand, seven hundred fifty-four".