1021052621 has 4 divisors (see below), whose sum is σ = 1021429500. Its totient is φ = 1020675744.

The previous prime is 1021052567. The next prime is 1021052663. The reversal of 1021052621 is 1262501201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 905167396 + 115885225 = 30086^2 + 10765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021052621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021052593 and 1021052602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021052671) 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, 184346 + ... + 189803.

It is an arithmetic number, because the mean of its divisors is an integer number (255357375).

Almost surely, 2^1021052621 is an apocalyptic number.

It is an amenable number.

1021052621 is a deficient number, since it is larger than the sum of its proper divisors (376879).

1021052621 is an equidigital number, since it uses as much as digits as its factorization.

1021052621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376878.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1021052621 is about 31953.9140169088. The cubic root of 1021052621 is about 1006.9688624748.

Adding to 1021052621 its reverse (1262501201), we get a palindrome (2283553822).

The spelling of 1021052621 in words is "one billion, twenty-one million, fifty-two thousand, six hundred twenty-one".