21500052305450 has 48 divisors (see below), whose sum is σ = 40214344878360. Its totient is φ = 8551928325120.

The previous prime is 21500052305441. The next prime is 21500052305467. The reversal of 21500052305450 is 5450325000512.

It can be written as a sum of positive squares in 12 ways, for example, as 5298002424121 + 16202049881329 = 2301739^2 + 4025177^2 .

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, 4824374 + ... + 8140926.

Almost surely, 2^{21500052305450} is an apocalyptic number.

21500052305450 is a deficient number, since it is larger than the sum of its proper divisors (18714292572910).

21500052305450 is a wasteful number, since it uses less digits than its factorization.

21500052305450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317291 (or 3317286 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 32.

Adding to 21500052305450 its reverse (5450325000512), we get a palindrome (26950377305962).

The spelling of 21500052305450 in words is "twenty-one trillion, five hundred billion, fifty-two million, three hundred five thousand, four hundred fifty".