21450021432010 has 8 divisors (see below), whose sum is σ = 38610038577636. Its totient is φ = 8580008572800.

The previous prime is 21450021431957. The next prime is 21450021432011. The reversal of 21450021432010 is 1023412005412.

It can be written as a sum of positive squares in 2 ways, for example, as 18562818954681 + 2887202477329 = 4308459^2 + 1699177^2 .

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 (21450021432011) 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, 1072501071591 + ... + 1072501071610.

Almost surely, 2^{21450021432010} is an apocalyptic number.

21450021432010 is a deficient number, since it is larger than the sum of its proper divisors (17160017145626).

21450021432010 is a wasteful number, since it uses less digits than its factorization.

21450021432010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145002143208.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21450021432010 its reverse (1023412005412), we get a palindrome (22473433437422).

The spelling of 21450021432010 in words is "twenty-one trillion, four hundred fifty billion, twenty-one million, four hundred thirty-two thousand, ten".