42021510121 has 8 divisors (see below), whose sum is σ = 43070402088. Its totient is φ = 40973760000.

The previous prime is 42021510119. The next prime is 42021510149. The reversal of 42021510121 is 12101512024.

It can be written as a sum of positive squares in 4 ways, for example, as 786522025 + 41234988096 = 28045^2 + 203064^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42021510121 - 2¹ = 42021510119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42021550121) 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, 210700 + ... + 358381.

It is an arithmetic number, because the mean of its divisors is an integer number (5383800261).

Almost surely, 2^42021510121 is an apocalyptic number.

42021510121 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42021510121 is a deficient number, since it is larger than the sum of its proper divisors (1048891967).

42021510121 is a wasteful number, since it uses less digits than its factorization.

42021510121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570923.

The product of its (nonzero) digits is 160, while the sum is 19.

It can be divided in two parts, 420215 and 10121, that added together give a square (430336 = 656²).

The spelling of 42021510121 in words is "forty-two billion, twenty-one million, five hundred ten thousand, one hundred twenty-one".