21142242455 has 8 divisors (see below), whose sum is σ = 25849383552. Its totient is φ = 16594665568.

The previous prime is 21142242449. The next prime is 21142242463. The reversal of 21142242455 is 55424224112.

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 21142242455 - 2⁴ = 21142242439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39890759 + ... + 39891288.

It is an arithmetic number, because the mean of its divisors is an integer number (3231172944).

Almost surely, 2^21142242455 is an apocalyptic number.

21142242455 is a deficient number, since it is larger than the sum of its proper divisors (4707141097).

21142242455 is an equidigital number, since it uses as much as digits as its factorization.

21142242455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79782105.

The product of its digits is 25600, while the sum is 32.

Adding to 21142242455 its reverse (55424224112), we get a palindrome (76566466567).

The spelling of 21142242455 in words is "twenty-one billion, one hundred forty-two million, two hundred forty-two thousand, four hundred fifty-five".