21150420398 has 4 divisors (see below), whose sum is σ = 31725630600. Its totient is φ = 10575210198.

The previous prime is 21150420391. The next prime is 21150420419. The reversal of 21150420398 is 89302405112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150420391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5287605098 + ... + 5287605101.

It is an arithmetic number, because the mean of its divisors is an integer number (7931407650).

Almost surely, 2^21150420398 is an apocalyptic number.

21150420398 is a deficient number, since it is larger than the sum of its proper divisors (10575210202).

21150420398 is a wasteful number, since it uses less digits than its factorization.

21150420398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10575210201.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 21150420398 in words is "twenty-one billion, one hundred fifty million, four hundred twenty thousand, three hundred ninety-eight".