155220021512426 has 12 divisors (see below), whose sum is σ = 252117727250022. Its totient is φ = 71640009928656.

The previous prime is 155220021512411. The next prime is 155220021512429. The reversal of 155220021512426 is 624215120022551.

It can be written as a sum of positive squares in 3 ways, for example, as 39354280343401 + 115865741169025 = 6273299^2 + 10764095^2 .

It is a super-3 number, since 3×155220021512426³ (a number of 44 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155220021512426.

It is not an unprimeable number, because it can be changed into a prime (155220021512429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 229615416101 + ... + 229615416776.

Almost surely, 2^{155220021512426} is an apocalyptic number.

155220021512426 is a deficient number, since it is larger than the sum of its proper divisors (96897705737596).

155220021512426 is a wasteful number, since it uses less digits than its factorization.

155220021512426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459230832905 (or 459230832892 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 38.

Adding to 155220021512426 its reverse (624215120022551), we get a palindrome (779435141534977).

The spelling of 155220021512426 in words is "one hundred fifty-five trillion, two hundred twenty billion, twenty-one million, five hundred twelve thousand, four hundred twenty-six".