21522442619 has 4 divisors (see below), whose sum is σ = 21928526496. Its totient is φ = 21116358744.

The previous prime is 21522442609. The next prime is 21522442687. The reversal of 21522442619 is 91624422512.

It is a happy number.

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 21522442619 - 2¹² = 21522438523 is a prime.

It is a super-2 number, since 2×21522442619² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21522442609) 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, 203041859 + ... + 203041964.

It is an arithmetic number, because the mean of its divisors is an integer number (5482131624).

Almost surely, 2^21522442619 is an apocalyptic number.

21522442619 is a deficient number, since it is larger than the sum of its proper divisors (406083877).

21522442619 is an equidigital number, since it uses as much as digits as its factorization.

21522442619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406083876.

The product of its digits is 69120, while the sum is 38.

The spelling of 21522442619 in words is "twenty-one billion, five hundred twenty-two million, four hundred forty-two thousand, six hundred nineteen".