1921450007 has 4 divisors (see below), whose sum is σ = 2034476496. Its totient is φ = 1808423520.

The previous prime is 1921450001. The next prime is 1921450019. The reversal of 1921450007 is 7000541291.

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 1921450007 - 2¹⁰ = 1921448983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921450001) 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, 56513219 + ... + 56513252.

It is an arithmetic number, because the mean of its divisors is an integer number (508619124).

Almost surely, 2^1921450007 is an apocalyptic number.

1921450007 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1921450007 is a deficient number, since it is larger than the sum of its proper divisors (113026489).

1921450007 is a wasteful number, since it uses less digits than its factorization.

1921450007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113026488.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1921450007 is about 43834.3473431509. The cubic root of 1921450007 is about 1243.2058062118.

Adding to 1921450007 its reverse (7000541291), we get a palindrome (8921991298).

The spelling of 1921450007 in words is "one billion, nine hundred twenty-one million, four hundred fifty thousand, seven".