105421390 has 32 divisors (see below), whose sum is σ = 198132480. Its totient is φ = 40339200.

The previous prime is 105421387. The next prime is 105421447. The reversal of 105421390 is 93124501.

It is a super-2 number, since 2×105421390² = 22227338939064200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25680 + ... + 29500.

It is an arithmetic number, because the mean of its divisors is an integer number (6191640).

Almost surely, 2^105421390 is an apocalyptic number.

105421390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

105421390 is a deficient number, since it is larger than the sum of its proper divisors (92711090).

105421390 is a wasteful number, since it uses less digits than its factorization.

105421390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 105421390 is about 10267.4919040630. The cubic root of 105421390 is about 472.3996632874.

Adding to 105421390 its reverse (93124501), we get a palindrome (198545891).

The spelling of 105421390 in words is "one hundred five million, four hundred twenty-one thousand, three hundred ninety".