21150736254 has 32 divisors (see below), whose sum is σ = 47110740480. Its totient is φ = 7033879800.

The previous prime is 21150736253. The next prime is 21150736259. The reversal of 21150736254 is 45263705112.

21150736254 is a `hidden beast` number, since 21 + 1 + 5 + 0 + 7 + 3 + 625 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150736253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431112 + ... + 477659.

It is an arithmetic number, because the mean of its divisors is an integer number (1472210640).

Almost surely, 2^21150736254 is an apocalyptic number.

21150736254 is an abundant number, since it is smaller than the sum of its proper divisors (25960004226).

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

21150736254 is a wasteful number, since it uses less digits than its factorization.

21150736254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909213 (or 909207 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 21150736254 in words is "twenty-one billion, one hundred fifty million, seven hundred thirty-six thousand, two hundred fifty-four".