20211215403 has 8 divisors (see below), whose sum is σ = 27003624448. Its totient is φ = 13446474984.

The previous prime is 20211215399. The next prime is 20211215413. The reversal of 20211215403 is 30451211202.

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

It is not a de Polignac number, because 20211215403 - 2² = 20211215399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211215403.

It is not an unprimeable number, because it can be changed into a prime (20211215413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6915451 + ... + 6918372.

It is an arithmetic number, because the mean of its divisors is an integer number (3375453056).

Almost surely, 2^20211215403 is an apocalyptic number.

20211215403 is a deficient number, since it is larger than the sum of its proper divisors (6792409045).

20211215403 is a wasteful number, since it uses less digits than its factorization.

20211215403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13834313.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 20211215403 its reverse (30451211202), we get a palindrome (50662426605).

The spelling of 20211215403 in words is "twenty billion, two hundred eleven million, two hundred fifteen thousand, four hundred three".