21027405570 has 32 divisors (see below), whose sum is σ = 53434349568. Its totient is φ = 5277466368.

The previous prime is 21027405559. The next prime is 21027405571. The reversal of 21027405570 is 7550472012.

It is not an unprimeable number, because it can be changed into a prime (21027405571) by changing a digit.

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, 20614594 + ... + 20615613.

It is an arithmetic number, because the mean of its divisors is an integer number (1669823424).

Almost surely, 2^21027405570 is an apocalyptic number.

21027405570 is an abundant number, since it is smaller than the sum of its proper divisors (32406943998).

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

21027405570 is a wasteful number, since it uses less digits than its factorization.

21027405570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41230234.

The product of its (nonzero) digits is 19600, while the sum is 33.

Adding to 21027405570 its reverse (7550472012), we get a palindrome (28577877582).

The spelling of 21027405570 in words is "twenty-one billion, twenty-seven million, four hundred five thousand, five hundred seventy".