1234100021 has 16 divisors (see below), whose sum is σ = 1550745600. Its totient is φ = 954056880.

The previous prime is 1234100003. The next prime is 1234100033. The reversal of 1234100021 is 1200014321.

It is not a de Polignac number, because 1234100021 - 2¹⁰ = 1234098997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1234099969 and 1234100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234100081) 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, 53321 + ... + 72878.

It is an arithmetic number, because the mean of its divisors is an integer number (96921600).

Almost surely, 2^1234100021 is an apocalyptic number.

1234100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1234100021 is a deficient number, since it is larger than the sum of its proper divisors (316645579).

1234100021 is a wasteful number, since it uses less digits than its factorization.

1234100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126344.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1234100021 is about 35129.7597629133. The cubic root of 1234100021 is about 1072.6304457517.

Adding to 1234100021 its reverse (1200014321), we get a palindrome (2434114342).

The spelling of 1234100021 in words is "one billion, two hundred thirty-four million, one hundred thousand, twenty-one".