42142602421 has 4 divisors (see below), whose sum is σ = 44621579052. Its totient is φ = 39663625792.

The previous prime is 42142602419. The next prime is 42142602427. The reversal of 42142602421 is 12420624124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31323690225 + 10818912196 = 176985^2 + 104014^2 .

It is a cyclic number.

It is not a de Polignac number, because 42142602421 - 2¹ = 42142602419 is a prime.

It is a super-2 number, since 2×42142602421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42142602421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42142602427) 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, 1239488290 + ... + 1239488323.

It is an arithmetic number, because the mean of its divisors is an integer number (11155394763).

Almost surely, 2^42142602421 is an apocalyptic number.

It is an amenable number.

42142602421 is a deficient number, since it is larger than the sum of its proper divisors (2478976631).

42142602421 is a wasteful number, since it uses less digits than its factorization.

42142602421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478976630.

The product of its (nonzero) digits is 6144, while the sum is 28.

The spelling of 42142602421 in words is "forty-two billion, one hundred forty-two million, six hundred two thousand, four hundred twenty-one".