21010534254 has 24 divisors (see below), whose sum is σ = 45526915512. Its totient is φ = 7002882000.

The previous prime is 21010534219. The next prime is 21010534271. The reversal of 21010534254 is 45243501012.

21010534254 is a `hidden beast` number, since 2 + 101 + 0 + 534 + 25 + 4 = 666.

It is a congruent 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, 181629 + ... + 273879.

It is an arithmetic number, because the mean of its divisors is an integer number (1896954813).

Almost surely, 2^21010534254 is an apocalyptic number.

21010534254 is an abundant number, since it is smaller than the sum of its proper divisors (24516381258).

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

21010534254 is a wasteful number, since it uses less digits than its factorization.

21010534254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104912 (or 104909 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21010534254 in words is "twenty-one billion, ten million, five hundred thirty-four thousand, two hundred fifty-four".