2102205451 has 4 divisors (see below), whose sum is σ = 2193605712. Its totient is φ = 2010805192.

The previous prime is 2102205439. The next prime is 2102205481. The reversal of 2102205451 is 1545022012.

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 2102205451 - 2⁷ = 2102205323 is a prime.

It is a super-2 number, since 2×2102205451² = 8838535516428226802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102205481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45700096 + ... + 45700141.

It is an arithmetic number, because the mean of its divisors is an integer number (548401428).

Almost surely, 2^2102205451 is an apocalyptic number.

2102205451 is a deficient number, since it is larger than the sum of its proper divisors (91400261).

2102205451 is an equidigital number, since it uses as much as digits as its factorization.

2102205451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91400260.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2102205451 is about 45849.8140781399. The cubic root of 2102205451 is about 1281.0273025248.

Adding to 2102205451 its reverse (1545022012), we get a palindrome (3647227463).

The spelling of 2102205451 in words is "two billion, one hundred two million, two hundred five thousand, four hundred fifty-one".