21417404037121 has 4 divisors (see below), whose sum is σ = 21432205285312. Its totient is φ = 21402602788932.

The previous prime is 21417404037119. The next prime is 21417404037131. The reversal of 21417404037121 is 12173040471412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21417404037121 - 2¹ = 21417404037119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21417404037131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7400621925 + ... + 7400624818.

It is an arithmetic number, because the mean of its divisors is an integer number (5358051321328).

Almost surely, 2^{21417404037121} is an apocalyptic number.

It is an amenable number.

21417404037121 is a deficient number, since it is larger than the sum of its proper divisors (14801248191).

21417404037121 is a wasteful number, since it uses less digits than its factorization.

21417404037121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14801248190.

The product of its (nonzero) digits is 37632, while the sum is 37.

The spelling of 21417404037121 in words is "twenty-one trillion, four hundred seventeen billion, four hundred four million, thirty-seven thousand, one hundred twenty-one".