21405432332450 has 24 divisors (see below), whose sum is σ = 39814227178752. Its totient is φ = 8562146472720.

The previous prime is 21405432332441. The next prime is 21405432332461. The reversal of 21405432332450 is 5423323450412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27826907 + ... + 28585793.

It is an arithmetic number, because the mean of its divisors is an integer number (1658926132448).

Almost surely, 2^{21405432332450} is an apocalyptic number.

21405432332450 is a deficient number, since it is larger than the sum of its proper divisors (18408794846302).

21405432332450 is a wasteful number, since it uses less digits than its factorization.

21405432332450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323026 (or 1323021 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 38.

Adding to 21405432332450 its reverse (5423323450412), we get a palindrome (26828755782862).

The spelling of 21405432332450 in words is "twenty-one trillion, four hundred five billion, four hundred thirty-two million, three hundred thirty-two thousand, four hundred fifty".