20212505103 has 16 divisors (see below), whose sum is σ = 30803302400. Its totient is φ = 11548767456.

The previous prime is 20212505099. The next prime is 20212505107. The reversal of 20212505103 is 30150521202.

It is an interprime number because it is at equal distance from previous prime (20212505099) and next prime (20212505107).

It is not a de Polignac number, because 20212505103 - 2² = 20212505099 is a prime.

It is a super-3 number, since 3×20212505103³ (a number of 32 digits) contains 333 as substring.

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

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 20212505103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212505107) 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, 172101 + ... + 264657.

It is an arithmetic number, because the mean of its divisors is an integer number (1925206400).

Almost surely, 2^20212505103 is an apocalyptic number.

20212505103 is a deficient number, since it is larger than the sum of its proper divisors (10590797297).

20212505103 is a wasteful number, since it uses less digits than its factorization.

20212505103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102966.

The product of its (nonzero) digits is 600, while the sum is 21.

The spelling of 20212505103 in words is "twenty billion, two hundred twelve million, five hundred five thousand, one hundred three".