21045452403 has 8 divisors (see below), whose sum is σ = 28248930000. Its totient is φ = 13936138208.

The previous prime is 21045452399. The next prime is 21045452459. The reversal of 21045452403 is 30425454012.

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 21045452403 - 2² = 21045452399 is a prime.

It is a super-2 number, since 2×21045452403² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21045452473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23540328 + ... + 23541221.

It is an arithmetic number, because the mean of its divisors is an integer number (3531116250).

Almost surely, 2^21045452403 is an apocalyptic number.

21045452403 is a deficient number, since it is larger than the sum of its proper divisors (7203477597).

21045452403 is a wasteful number, since it uses less digits than its factorization.

21045452403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47081701.

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 21045452403 in words is "twenty-one billion, forty-five million, four hundred fifty-two thousand, four hundred three".