21216030416612 has 12 divisors (see below), whose sum is σ = 38131514127420. Its totient is φ = 10321312094496.

The previous prime is 21216030416491. The next prime is 21216030416629. The reversal of 21216030416612 is 21661403061212.

It can be written as a sum of positive squares in 2 ways, for example, as 8759196644836 + 12456833771776 = 2959594^2 + 3529424^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71675778287 + ... + 71675778582.

It is an arithmetic number, because the mean of its divisors is an integer number (3177626177285).

Almost surely, 2^{21216030416612} is an apocalyptic number.

It is an amenable number.

21216030416612 is a deficient number, since it is larger than the sum of its proper divisors (16915483710808).

21216030416612 is a wasteful number, since it uses less digits than its factorization.

21216030416612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143351556910 (or 143351556908 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

Adding to 21216030416612 its reverse (21661403061212), we get a palindrome (42877433477824).

The spelling of 21216030416612 in words is "twenty-one trillion, two hundred sixteen billion, thirty million, four hundred sixteen thousand, six hundred twelve".