21603414361 has 9 divisors (see below), whose sum is σ = 21830490741. Its totient is φ = 21378680412.

The previous prime is 21603414347. The next prime is 21603414397. The reversal of 21603414361 is 16341430612.

It is a happy number.

The square root of 21603414361 is 146981.

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

It is not a de Polignac number, because 21603414361 - 2¹⁵ = 21603381593 is a prime.

It is a super-2 number, since 2×21603414361² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21603414661) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15138330 + ... + 15139756.

Almost surely, 2^21603414361 is an apocalyptic number.

21603414361 is the 146981-st square number.

21603414361 is the 73491-st centered octagonal number.

It is an amenable number.

21603414361 is a deficient number, since it is larger than the sum of its proper divisors (227076380).

21603414361 is an frugal number, since it uses more digits than its factorization.

21603414361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060 (or 1530 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21603414361 its reverse (16341430612), we get a palindrome (37944844973).

The spelling of 21603414361 in words is "twenty-one billion, six hundred three million, four hundred fourteen thousand, three hundred sixty-one".