2105421550 has 12 divisors (see below), whose sum is σ = 3916084176. Its totient is φ = 842168600.

The previous prime is 2105421529. The next prime is 2105421553. The reversal of 2105421550 is 551245012.

It is a super-3 number, since 3×2105421550³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105421553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21054166 + ... + 21054265.

It is an arithmetic number, because the mean of its divisors is an integer number (326340348).

Almost surely, 2^2105421550 is an apocalyptic number.

2105421550 is a deficient number, since it is larger than the sum of its proper divisors (1810662626).

2105421550 is a wasteful number, since it uses less digits than its factorization.

2105421550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42108443 (or 42108438 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 2105421550 is about 45884.8727795992. The cubic root of 2105421550 is about 1281.6802376655.

Adding to 2105421550 its reverse (551245012), we get a palindrome (2656666562).

The spelling of 2105421550 in words is "two billion, one hundred five million, four hundred twenty-one thousand, five hundred fifty".