21142345355 has 4 divisors (see below), whose sum is σ = 25370814432. Its totient is φ = 16913876280.

The previous prime is 21142345351. The next prime is 21142345369. The reversal of 21142345355 is 55354324112.

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

It is not a de Polignac number, because 21142345355 - 2² = 21142345351 is a prime.

It is a super-2 number, since 2×21142345355² (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 (21142345351) 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, 2114234531 + ... + 2114234540.

It is an arithmetic number, because the mean of its divisors is an integer number (6342703608).

Almost surely, 2^21142345355 is an apocalyptic number.

21142345355 is a deficient number, since it is larger than the sum of its proper divisors (4228469077).

21142345355 is an equidigital number, since it uses as much as digits as its factorization.

21142345355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228469076.

The product of its digits is 72000, while the sum is 35.

Adding to 21142345355 its reverse (55354324112), we get a palindrome (76496669467).

The spelling of 21142345355 in words is "twenty-one billion, one hundred forty-two million, three hundred forty-five thousand, three hundred fifty-five".