21864087225570 has 64 divisors (see below), whose sum is σ = 52493041336320. Its totient is φ = 5828286840768.

The previous prime is 21864087225559. The next prime is 21864087225581. The reversal of 21864087225570 is 7552278046812.

It is an interprime number because it is at equal distance from previous prime (21864087225559) and next prime (21864087225581).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21864087225570.

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 31 ways as a sum of consecutive naturals, for example, 1598361991 + ... + 1598375669.

It is an arithmetic number, because the mean of its divisors is an integer number (820203770880).

Almost surely, 2^{21864087225570} is an apocalyptic number.

21864087225570 is an abundant number, since it is smaller than the sum of its proper divisors (30628954110750).

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

21864087225570 is a wasteful number, since it uses less digits than its factorization.

21864087225570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29319.

The product of its (nonzero) digits is 15052800, while the sum is 57.

The spelling of 21864087225570 in words is "twenty-one trillion, eight hundred sixty-four billion, eighty-seven million, two hundred twenty-five thousand, five hundred seventy".