20415531353121 has 24 divisors (see below), whose sum is σ = 29798264297984. Its totient is φ = 13467711939840.

The previous prime is 20415531353117. The next prime is 20415531353137. The reversal of 20415531353121 is 12135313551402.

It is a happy number.

20415531353121 is a `hidden beast` number, since 2 + 0 + 4 + 155 + 31 + 353 + 121 = 666.

It is not a de Polignac number, because 20415531353121 - 2² = 20415531353117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415531354121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3036420 + ... + 7074666.

Almost surely, 2^{20415531353121} is an apocalyptic number.

It is an amenable number.

20415531353121 is a deficient number, since it is larger than the sum of its proper divisors (9382732944863).

20415531353121 is a wasteful number, since it uses less digits than its factorization.

20415531353121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044141 (or 4044138 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 20415531353121 in words is "twenty trillion, four hundred fifteen billion, five hundred thirty-one million, three hundred fifty-three thousand, one hundred twenty-one".