1021603253 has 8 divisors (see below), whose sum is σ = 1180033920. Its totient is φ = 874098880.

The previous prime is 1021603243. The next prime is 1021603279. The reversal of 1021603253 is 3523061201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021603253 - 2⁸ = 1021602997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021603223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2731373 + ... + 2731746.

It is an arithmetic number, because the mean of its divisors is an integer number (147504240).

Almost surely, 2^1021603253 is an apocalyptic number.

It is an amenable number.

1021603253 is a deficient number, since it is larger than the sum of its proper divisors (158430667).

1021603253 is a wasteful number, since it uses less digits than its factorization.

1021603253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463147.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1021603253 is about 31962.5288893104. The cubic root of 1021603253 is about 1007.1498422552.

Adding to 1021603253 its reverse (3523061201), we get a palindrome (4544664454).

The spelling of 1021603253 in words is "one billion, twenty-one million, six hundred three thousand, two hundred fifty-three".