21024351412 has 12 divisors (see below), whose sum is σ = 36979380900. Its totient is φ = 10458814016.

The previous prime is 21024351407. The next prime is 21024351443. The reversal of 21024351412 is 21415342012.

It can be written as a sum of positive squares in 2 ways, for example, as 17756628516 + 3267722896 = 133254^2 + 57164^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13339537 + ... + 13341112.

It is an arithmetic number, because the mean of its divisors is an integer number (3081615075).

Almost surely, 2^21024351412 is an apocalyptic number.

It is an amenable number.

21024351412 is a deficient number, since it is larger than the sum of its proper divisors (15955029488).

21024351412 is a wasteful number, since it uses less digits than its factorization.

21024351412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26680850 (or 26680848 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21024351412 its reverse (21415342012), we get a palindrome (42439693424).

The spelling of 21024351412 in words is "twenty-one billion, twenty-four million, three hundred fifty-one thousand, four hundred twelve".