21345352254 has 32 divisors (see below), whose sum is σ = 47439555840. Its totient is φ = 7114301496.

The previous prime is 21345352151. The next prime is 21345352271. The reversal of 21345352254 is 45225354312.

21345352254 is a `hidden beast` number, since 2 + 1 + 34 + 53 + 522 + 54 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619509 + ... + 653055.

It is an arithmetic number, because the mean of its divisors is an integer number (1482486120).

Almost surely, 2^21345352254 is an apocalyptic number.

21345352254 is an abundant number, since it is smaller than the sum of its proper divisors (26094203586).

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

21345352254 is a wasteful number, since it uses less digits than its factorization.

21345352254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45341 (or 45335 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

The spelling of 21345352254 in words is "twenty-one billion, three hundred forty-five million, three hundred fifty-two thousand, two hundred fifty-four".