21242122407 has 48 divisors (see below), whose sum is σ = 34090392960. Its totient is φ = 12636993600.

The previous prime is 21242122381. The next prime is 21242122409. The reversal of 21242122407 is 70422124212.

It is a happy number.

21242122407 is a `hidden beast` number, since 2 + 1 + 242 + 12 + 2 + 407 = 666.

It is not a de Polignac number, because 21242122407 - 2¹⁴ = 21242106023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242122409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4594557 + ... + 4599177.

It is an arithmetic number, because the mean of its divisors is an integer number (710216520).

Almost surely, 2^21242122407 is an apocalyptic number.

21242122407 is a deficient number, since it is larger than the sum of its proper divisors (12848270553).

21242122407 is a wasteful number, since it uses less digits than its factorization.

21242122407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5484 (or 5481 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

Adding to 21242122407 its reverse (70422124212), we get a palindrome (91664246619).

The spelling of 21242122407 in words is "twenty-one billion, two hundred forty-two million, one hundred twenty-two thousand, four hundred seven".