21015331060 has 12 divisors (see below), whose sum is σ = 44132195268. Its totient is φ = 8406132416.

The previous prime is 21015331039. The next prime is 21015331067. The reversal of 21015331060 is 6013351012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10768627984 + 10246703076 = 103772^2 + 101226^2 .

It is a super-2 number, since 2×21015331060² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21015331067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525383257 + ... + 525383296.

It is an arithmetic number, because the mean of its divisors is an integer number (3677682939).

Almost surely, 2^21015331060 is an apocalyptic number.

21015331060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21015331060 is an abundant number, since it is smaller than the sum of its proper divisors (23116864208).

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

21015331060 is a wasteful number, since it uses less digits than its factorization.

21015331060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050766562 (or 1050766560 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21015331060 its reverse (6013351012), we get a palindrome (27028682072).

The spelling of 21015331060 in words is "twenty-one billion, fifteen million, three hundred thirty-one thousand, sixty".