21210727254 has 16 divisors (see below), whose sum is σ = 44654162880. Its totient is φ = 6698124360.

The previous prime is 21210727247. The next prime is 21210727271. The reversal of 21210727254 is 45272701212.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93029392 + ... + 93029619.

It is an arithmetic number, because the mean of its divisors is an integer number (2790885180).

Almost surely, 2^21210727254 is an apocalyptic number.

21210727254 is an abundant number, since it is smaller than the sum of its proper divisors (23443435626).

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

21210727254 is a wasteful number, since it uses less digits than its factorization.

21210727254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186059035.

The product of its (nonzero) digits is 15680, while the sum is 33.

The spelling of 21210727254 in words is "twenty-one billion, two hundred ten million, seven hundred twenty-seven thousand, two hundred fifty-four".