201421542415 has 4 divisors (see below), whose sum is σ = 241705850904. Its totient is φ = 161137233928.

The previous prime is 201421542337. The next prime is 201421542437. The reversal of 201421542415 is 514245124102.

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 201421542415 - 2¹⁵ = 201421509647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20142154237 + ... + 20142154246.

It is an arithmetic number, because the mean of its divisors is an integer number (60426462726).

Almost surely, 2^201421542415 is an apocalyptic number.

201421542415 is a deficient number, since it is larger than the sum of its proper divisors (40284308489).

201421542415 is an equidigital number, since it uses as much as digits as its factorization.

201421542415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40284308488.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 201421542415 its reverse (514245124102), we get a palindrome (715666666517).

The spelling of 201421542415 in words is "two hundred one billion, four hundred twenty-one million, five hundred forty-two thousand, four hundred fifteen".