21361742407 has 8 divisors (see below), whose sum is σ = 22292688384. Its totient is φ = 20430977688.

The previous prime is 21361742359. The next prime is 21361742417. The reversal of 21361742407 is 70424716312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21361742407 - 2³¹ = 19214258759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361742417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231598 + ... + 310420.

It is an arithmetic number, because the mean of its divisors is an integer number (2786586048).

Almost surely, 2^21361742407 is an apocalyptic number.

21361742407 is a deficient number, since it is larger than the sum of its proper divisors (930945977).

21361742407 is a wasteful number, since it uses less digits than its factorization.

21361742407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90629.

The product of its (nonzero) digits is 56448, while the sum is 37.

The spelling of 21361742407 in words is "twenty-one billion, three hundred sixty-one million, seven hundred forty-two thousand, four hundred seven".