21027007572 has 24 divisors (see below), whose sum is σ = 49066565856. Its totient is φ = 7008495648.

The previous prime is 21027007553. The next prime is 21027007579. The reversal of 21027007572 is 27570072012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027007579) 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 7 ways as a sum of consecutive naturals, for example, 134103 + ... + 245025.

It is an arithmetic number, because the mean of its divisors is an integer number (2044440244).

Almost surely, 2^21027007572 is an apocalyptic number.

It is an amenable number.

21027007572 is an abundant number, since it is smaller than the sum of its proper divisors (28039558284).

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

21027007572 is a wasteful number, since it uses less digits than its factorization.

21027007572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126727 (or 126725 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 33.

Adding to 21027007572 its reverse (27570072012), we get a palindrome (48597079584).

The spelling of 21027007572 in words is "twenty-one billion, twenty-seven million, seven thousand, five hundred seventy-two".