21690416241 has 24 divisors (see below), whose sum is σ = 33748751400. Its totient is φ = 13344742656.

The previous prime is 21690416201. The next prime is 21690416243. The reversal of 21690416241 is 14261409612.

21690416241 is a `hidden beast` number, since 21 + 6 + 9 + 0 + 4 + 1 + 624 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2146376241 + 19544040000 = 46329^2 + 139800^2 .

It is not a de Polignac number, because 21690416241 - 2¹³ = 21690408049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21690416196 and 21690416205.

It is not an unprimeable number, because it can be changed into a prime (21690416243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 523995 + ... + 563871.

It is an arithmetic number, because the mean of its divisors is an integer number (1406197975).

Almost surely, 2^21690416241 is an apocalyptic number.

It is an amenable number.

21690416241 is a deficient number, since it is larger than the sum of its proper divisors (12058335159).

21690416241 is a wasteful number, since it uses less digits than its factorization.

21690416241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44545 (or 44542 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21690416241 in words is "twenty-one billion, six hundred ninety million, four hundred sixteen thousand, two hundred forty-one".