21124140352450 has 48 divisors (see below), whose sum is σ = 39841915719816. Its totient is φ = 8331232665600.

The previous prime is 21124140352429. The next prime is 21124140352463. The reversal of 21124140352450 is 5425304142112.

It can be written as a sum of positive squares in 12 ways, for example, as 504612750321 + 20619527602129 = 710361^2 + 4540873^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10464474 + ... + 12318826.

Almost surely, 2^{21124140352450} is an apocalyptic number.

21124140352450 is a deficient number, since it is larger than the sum of its proper divisors (18717775367366).

21124140352450 is a wasteful number, since it uses less digits than its factorization.

21124140352450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857559 (or 1857554 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 21124140352450 its reverse (5425304142112), we get a palindrome (26549444494562).

The spelling of 21124140352450 in words is "twenty-one trillion, one hundred twenty-four billion, one hundred forty million, three hundred fifty-two thousand, four hundred fifty".