21450035212545 has 32 divisors (see below), whose sum is σ = 34627475376000. Its totient is φ = 11337567417344.

The previous prime is 21450035212523. The next prime is 21450035212561. The reversal of 21450035212545 is 54521253005412.

It is a cyclic number.

It is not a de Polignac number, because 21450035212545 - 2¹² = 21450035208449 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15293431 + ... + 16636979.

It is an arithmetic number, because the mean of its divisors is an integer number (1082108605500).

Almost surely, 2^{21450035212545} is an apocalyptic number.

It is an amenable number.

21450035212545 is a deficient number, since it is larger than the sum of its proper divisors (13177440163455).

21450035212545 is a wasteful number, since it uses less digits than its factorization.

21450035212545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353089.

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 21450035212545 its reverse (54521253005412), we get a palindrome (75971288217957).

The spelling of 21450035212545 in words is "twenty-one trillion, four hundred fifty billion, thirty-five million, two hundred twelve thousand, five hundred forty-five".