21402541415 has 4 divisors (see below), whose sum is σ = 25683049704. Its totient is φ = 17122033128.

The previous prime is 21402541411. The next prime is 21402541441. The reversal of 21402541415 is 51414520412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21402541415 - 2² = 21402541411 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 (21402541411) 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, 2140254137 + ... + 2140254146.

It is an arithmetic number, because the mean of its divisors is an integer number (6420762426).

Almost surely, 2^21402541415 is an apocalyptic number.

21402541415 is a deficient number, since it is larger than the sum of its proper divisors (4280508289).

21402541415 is an equidigital number, since it uses as much as digits as its factorization.

21402541415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280508288.

The product of its (nonzero) digits is 6400, while the sum is 29.

The spelling of 21402541415 in words is "twenty-one billion, four hundred two million, five hundred forty-one thousand, four hundred fifteen".