402135541242121 has 8 divisors (see below), whose sum is σ = 406755556540200. Its totient is φ = 397517784576000.

The previous prime is 402135541242101. The next prime is 402135541242133. The reversal of 402135541242121 is 121242145531204.

It can be written as a sum of positive squares in 4 ways, for example, as 10483089817600 + 391652451424521 = 3237760^2 + 19790211^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 402135541242121 - 2¹³ = 402135541233929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402135541242101) 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, 564299856 + ... + 565012033.

It is an arithmetic number, because the mean of its divisors is an integer number (50844444567525).

Almost surely, 2^{402135541242121} is an apocalyptic number.

It is an amenable number.

402135541242121 is a deficient number, since it is larger than the sum of its proper divisors (4620015298079).

402135541242121 is a wasteful number, since it uses less digits than its factorization.

402135541242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129315979.

The product of its (nonzero) digits is 76800, while the sum is 37.

Adding to 402135541242121 its reverse (121242145531204), we get a palindrome (523377686773325).

The spelling of 402135541242121 in words is "four hundred two trillion, one hundred thirty-five billion, five hundred forty-one million, two hundred forty-two thousand, one hundred twenty-one".