21145310342 has 16 divisors (see below), whose sum is σ = 34229139840. Its totient is φ = 9738993792.

The previous prime is 21145310341. The next prime is 21145310363. The reversal of 21145310342 is 24301354112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145310341) 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, 836483 + ... + 861390.

It is an arithmetic number, because the mean of its divisors is an integer number (2139321240).

Almost surely, 2^21145310342 is an apocalyptic number.

21145310342 is a deficient number, since it is larger than the sum of its proper divisors (13083829498).

21145310342 is a wasteful number, since it uses less digits than its factorization.

21145310342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698367.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21145310342 its reverse (24301354112), we get a palindrome (45446664454).

The spelling of 21145310342 in words is "twenty-one billion, one hundred forty-five million, three hundred ten thousand, three hundred forty-two".