21493455002 has 8 divisors (see below), whose sum is σ = 32299777812. Its totient is φ = 10726862400.

The previous prime is 21493454963. The next prime is 21493455007. The reversal of 21493455002 is 20055439412.

It can be written as a sum of positive squares in 2 ways, for example, as 21418615201 + 74839801 = 146351^2 + 8651^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21493455007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9931199 + ... + 9933362.

Almost surely, 2^21493455002 is an apocalyptic number.

21493455002 is a deficient number, since it is larger than the sum of its proper divisors (10806322810).

21493455002 is a wasteful number, since it uses less digits than its factorization.

21493455002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19865104.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21493455002 in words is "twenty-one billion, four hundred ninety-three million, four hundred fifty-five thousand, two".