21123401415 has 8 divisors (see below), whose sum is σ = 33797442288. Its totient is φ = 11265814080.

The previous prime is 21123401389. The next prime is 21123401423. The reversal of 21123401415 is 51410432112.

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

It is not a de Polignac number, because 21123401415 - 2¹⁰ = 21123400391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704113366 + ... + 704113395.

It is an arithmetic number, because the mean of its divisors is an integer number (4224680286).

Almost surely, 2^21123401415 is an apocalyptic number.

21123401415 is a deficient number, since it is larger than the sum of its proper divisors (12674040873).

21123401415 is a wasteful number, since it uses less digits than its factorization.

21123401415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408226769.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21123401415 its reverse (51410432112), we get a palindrome (72533833527).

The spelling of 21123401415 in words is "twenty-one billion, one hundred twenty-three million, four hundred one thousand, four hundred fifteen".