21214201544 has 8 divisors (see below), whose sum is σ = 39776627910. Its totient is φ = 10607100768.

The previous prime is 21214201543. The next prime is 21214201579. The reversal of 21214201544 is 44510241212.

It can be written as a sum of positive squares in only one way, i.e., 13476888100 + 7737313444 = 116090^2 + 87962^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21214201543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325887589 + ... + 1325887604.

Almost surely, 2^21214201544 is an apocalyptic number.

It is an amenable number.

21214201544 is a deficient number, since it is larger than the sum of its proper divisors (18562426366).

21214201544 is a wasteful number, since it uses less digits than its factorization.

21214201544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651775199 (or 2651775195 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 21214201544 its reverse (44510241212), we get a palindrome (65724442756).

The spelling of 21214201544 in words is "twenty-one billion, two hundred fourteen million, two hundred one thousand, five hundred forty-four".