42102123420321 has 24 divisors (see below), whose sum is σ = 64391946188544. Its totient is φ = 26416828540800.

The previous prime is 42102123420233. The next prime is 42102123420361. The reversal of 42102123420321 is 12302432120124.

42102123420321 is a `hidden beast` number, since 4 + 2 + 1 + 0 + 212 + 3 + 420 + 3 + 21 = 666.

It is not a de Polignac number, because 42102123420321 - 2⁹ = 42102123419809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42102123420361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22097496 + ... + 23927046.

It is an arithmetic number, because the mean of its divisors is an integer number (2682997757856).

Almost surely, 2^{42102123420321} is an apocalyptic number.

It is an amenable number.

42102123420321 is a deficient number, since it is larger than the sum of its proper divisors (22289822768223).

42102123420321 is a wasteful number, since it uses less digits than its factorization.

42102123420321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979981 (or 1979978 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 42102123420321 its reverse (12302432120124), we get a palindrome (54404555540445).

The spelling of 42102123420321 in words is "forty-two trillion, one hundred two billion, one hundred twenty-three million, four hundred twenty thousand, three hundred twenty-one".