21276145412 has 6 divisors (see below), whose sum is σ = 37233254478. Its totient is φ = 10638072704.

The previous prime is 21276145379. The next prime is 21276145417. The reversal of 21276145412 is 21454167212.

It can be written as a sum of positive squares in only one way, i.e., 21273972736 + 2172676 = 145856^2 + 1474^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21276145417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2659518173 + ... + 2659518180.

It is an arithmetic number, because the mean of its divisors is an integer number (6205542413).

Almost surely, 2^21276145412 is an apocalyptic number.

It is an amenable number.

21276145412 is a deficient number, since it is larger than the sum of its proper divisors (15957109066).

21276145412 is a wasteful number, since it uses less digits than its factorization.

21276145412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5319036357 (or 5319036355 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The spelling of 21276145412 in words is "twenty-one billion, two hundred seventy-six million, one hundred forty-five thousand, four hundred twelve".