1516045021 has 4 divisors (see below), whose sum is σ = 1518543232. Its totient is φ = 1513546812.

The previous prime is 1516045009. The next prime is 1516045033. The reversal of 1516045021 is 1205406151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1516045009) and next prime (1516045033).

It is a cyclic number.

It is not a de Polignac number, because 1516045021 - 2¹⁹ = 1515520733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1516045121) 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, 1248195 + ... + 1249408.

It is an arithmetic number, because the mean of its divisors is an integer number (379635808).

Almost surely, 2^1516045021 is an apocalyptic number.

It is an amenable number.

1516045021 is a deficient number, since it is larger than the sum of its proper divisors (2498211).

1516045021 is an equidigital number, since it uses as much as digits as its factorization.

1516045021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498210.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1516045021 is about 38936.4228069298. The cubic root of 1516045021 is about 1148.7813229895.

The spelling of 1516045021 in words is "one billion, five hundred sixteen million, forty-five thousand, twenty-one".