21150420397 has 8 divisors (see below), whose sum is σ = 21412926720. Its totient is φ = 20888466720.

The previous prime is 21150420391. The next prime is 21150420419. The reversal of 21150420397 is 79302405112.

It is a happy number.

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 21150420397 - 2²³ = 21142031789 is a prime.

It is a Duffinian number.

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 in 7 ways as a sum of consecutive naturals, for example, 60879 + ... + 214492.

It is an arithmetic number, because the mean of its divisors is an integer number (2676615840).

Almost surely, 2^21150420397 is an apocalyptic number.

It is an amenable number.

21150420397 is a deficient number, since it is larger than the sum of its proper divisors (262506323).

21150420397 is an equidigital number, since it uses as much as digits as its factorization.

21150420397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276323.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21150420397 in words is "twenty-one billion, one hundred fifty million, four hundred twenty thousand, three hundred ninety-seven".