21034351445 has 8 divisors (see below), whose sum is σ = 25923417144. Its totient is φ = 16372684224.

The previous prime is 21034351433. The next prime is 21034351493. The reversal of 21034351445 is 54415343012.

It can be written as a sum of positive squares in 4 ways, for example, as 5632052209 + 15402299236 = 75047^2 + 124106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21034351445 - 2³⁰ = 19960609621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56849414 + ... + 56849783.

It is an arithmetic number, because the mean of its divisors is an integer number (3240427143).

Almost surely, 2^21034351445 is an apocalyptic number.

It is an amenable number.

21034351445 is a deficient number, since it is larger than the sum of its proper divisors (4889065699).

21034351445 is a wasteful number, since it uses less digits than its factorization.

21034351445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113699239.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21034351445 its reverse (54415343012), we get a palindrome (75449694457).

The spelling of 21034351445 in words is "twenty-one billion, thirty-four million, three hundred fifty-one thousand, four hundred forty-five".