21619947403 has 4 divisors (see below), whose sum is σ = 21622903848. Its totient is φ = 21616990960.

The previous prime is 21619947397. The next prime is 21619947439. The reversal of 21619947403 is 30474991612.

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

It is a cyclic number.

It is not a de Polignac number, because 21619947403 - 2³³ = 13030012811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21619947443) 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, 1467226 + ... + 1481887.

It is an arithmetic number, because the mean of its divisors is an integer number (5405725962).

Almost surely, 2^21619947403 is an apocalyptic number.

21619947403 is a deficient number, since it is larger than the sum of its proper divisors (2956445).

21619947403 is an equidigital number, since it uses as much as digits as its factorization.

21619947403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956444.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 21619947403 in words is "twenty-one billion, six hundred nineteen million, nine hundred forty-seven thousand, four hundred three".