21440152372 has 6 divisors (see below), whose sum is σ = 37520266658. Its totient is φ = 10720076184.

The previous prime is 21440152343. The next prime is 21440152373. The reversal of 21440152372 is 27325104412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21238398756 + 201753616 = 145734^2 + 14204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440152373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680019043 + ... + 2680019050.

Almost surely, 2^21440152372 is an apocalyptic number.

It is an amenable number.

21440152372 is a deficient number, since it is larger than the sum of its proper divisors (16080114286).

21440152372 is a wasteful number, since it uses less digits than its factorization.

21440152372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360038097 (or 5360038095 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 21440152372 its reverse (27325104412), we get a palindrome (48765256784).

The spelling of 21440152372 in words is "twenty-one billion, four hundred forty million, one hundred fifty-two thousand, three hundred seventy-two".