21001450442452 has 12 divisors (see below), whose sum is σ = 37534507174080. Its totient is φ = 10277305535576.

The previous prime is 21001450442389. The next prime is 21001450442527. The reversal of 21001450442452 is 25424405410012.

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, 55854921202 + ... + 55854921577.

It is an arithmetic number, because the mean of its divisors is an integer number (3127875597840).

Almost surely, 2^{21001450442452} is an apocalyptic number.

It is an amenable number.

21001450442452 is a deficient number, since it is larger than the sum of its proper divisors (16533056731628).

21001450442452 is a wasteful number, since it uses less digits than its factorization.

21001450442452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111709842830 (or 111709842828 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 34.

Adding to 21001450442452 its reverse (25424405410012), we get a palindrome (46425855852464).

The spelling of 21001450442452 in words is "twenty-one trillion, one billion, four hundred fifty million, four hundred forty-two thousand, four hundred fifty-two".