21612514232146 has 16 divisors (see below), whose sum is σ = 32563264837824. Its totient is φ = 10758097530864.

The previous prime is 21612514232143. The next prime is 21612514232173. The reversal of 21612514232146 is 64123241521612.

It is a junction number, because it is equal to n+sod(n) for n = 21612514232099 and 21612514232108.

It is not an unprimeable number, because it can be changed into a prime (21612514232143) 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, 7654576 + ... + 10090468.

It is an arithmetic number, because the mean of its divisors is an integer number (2035204052364).

Almost surely, 2^{21612514232146} is an apocalyptic number.

21612514232146 is a deficient number, since it is larger than the sum of its proper divisors (10950750605678).

21612514232146 is a wasteful number, since it uses less digits than its factorization.

21612514232146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455665.

The product of its digits is 138240, while the sum is 40.

Adding to 21612514232146 its reverse (64123241521612), we get a palindrome (85735755753758).

The spelling of 21612514232146 in words is "twenty-one trillion, six hundred twelve billion, five hundred fourteen million, two hundred thirty-two thousand, one hundred forty-six".