421201515 has 16 divisors (see below), whose sum is σ = 770197248. Its totient is φ = 192549216.

The previous prime is 421201513. The next prime is 421201567. The reversal of 421201515 is 515102124.

It is not a de Polignac number, because 421201515 - 2¹ = 421201513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 421201491 and 421201500.

It is not an unprimeable number, because it can be changed into a prime (421201513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2005617 + ... + 2005826.

It is an arithmetic number, because the mean of its divisors is an integer number (48137328).

Almost surely, 2^421201515 is an apocalyptic number.

421201515 is a deficient number, since it is larger than the sum of its proper divisors (348995733).

421201515 is a wasteful number, since it uses less digits than its factorization.

421201515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011458.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 421201515 is about 20523.1945612763. The cubic root of 421201515 is about 749.6006852124.

Adding to 421201515 its reverse (515102124), we get a palindrome (936303639).

The spelling of 421201515 in words is "four hundred twenty-one million, two hundred one thousand, five hundred fifteen".