102321210155442 has 128 divisors (see below), whose sum is σ = 221280743255040. Its totient is φ = 31425762170880.

The previous prime is 102321210155441. The next prime is 102321210155447. The reversal of 102321210155442 is 244551012123201.

It is not an unprimeable number, because it can be changed into a prime (102321210155441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 727743873 + ... + 727884459.

It is an arithmetic number, because the mean of its divisors is an integer number (1728755806680).

Almost surely, 2^{102321210155442} is an apocalyptic number.

102321210155442 is an abundant number, since it is smaller than the sum of its proper divisors (118959533099598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102321210155442 is a wasteful number, since it uses less digits than its factorization.

102321210155442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141336.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 102321210155442 its reverse (244551012123201), we get a palindrome (346872222278643).

The spelling of 102321210155442 in words is "one hundred two trillion, three hundred twenty-one billion, two hundred ten million, one hundred fifty-five thousand, four hundred forty-two".