21407201344 has 21 divisors (see below), whose sum is σ = 42482237997. Its totient is φ = 10703015424.

The previous prime is 21407201323. The next prime is 21407201359. The reversal of 21407201344 is 44310270412.

The square root of 21407201344 is 146312.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21108602944 + 298598400 = 145288^2 + 17280^2 .

It is a super-3 number, since 3×21407201344³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1161352 + ... + 1179640.

Almost surely, 2^21407201344 is an apocalyptic number.

21407201344 is the 146312-nd square number.

It is an amenable number.

21407201344 is a deficient number, since it is larger than the sum of its proper divisors (21075036653).

21407201344 is an frugal number, since it uses more digits than its factorization.

21407201344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36590 (or 18291 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

Adding to 21407201344 its reverse (44310270412), we get a palindrome (65717471756).

The spelling of 21407201344 in words is "twenty-one billion, four hundred seven million, two hundred one thousand, three hundred forty-four".