21615601014052 has 12 divisors (see below), whose sum is σ = 37835819549836. Its totient is φ = 10805366856960.

The previous prime is 21615601014041. The next prime is 21615601014053. The reversal of 21615601014052 is 25041010651612.

It can be written as a sum of positive squares in 2 ways, for example, as 4442003051236 + 17173597962816 = 2107606^2 + 4144104^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21615601013999 and 21615601014017.

It is not an unprimeable number, because it can be changed into a prime (21615601014053) 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 3 ways as a sum of consecutive naturals, for example, 608392533 + ... + 608428060.

Almost surely, 2^{21615601014052} is an apocalyptic number.

It is an amenable number.

21615601014052 is a deficient number, since it is larger than the sum of its proper divisors (16220218535784).

21615601014052 is a wasteful number, since it uses less digits than its factorization.

21615601014052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216825038 (or 1216825036 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

Adding to 21615601014052 its reverse (25041010651612), we get a palindrome (46656611665664).

The spelling of 21615601014052 in words is "twenty-one trillion, six hundred fifteen billion, six hundred one million, fourteen thousand, fifty-two".