15420216502 has 4 divisors (see below), whose sum is σ = 23130324756. Its totient is φ = 7710108250.

The previous prime is 15420216407. The next prime is 15420216523. The reversal of 15420216502 is 20561202451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20561202451 = 263 ⋅78179477.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3855054124 + ... + 3855054127.

It is an arithmetic number, because the mean of its divisors is an integer number (5782581189).

Almost surely, 2^15420216502 is an apocalyptic number.

15420216502 is a deficient number, since it is larger than the sum of its proper divisors (7710108254).

15420216502 is an equidigital number, since it uses as much as digits as its factorization.

15420216502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7710108253.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 15420216502 its reverse (20561202451), we get a palindrome (35981418953).

The spelling of 15420216502 in words is "fifteen billion, four hundred twenty million, two hundred sixteen thousand, five hundred two".