1021161245 has 32 divisors (see below), whose sum is σ = 1406426112. Its totient is φ = 705906432.

The previous prime is 1021161233. The next prime is 1021161247. The reversal of 1021161245 is 5421611201.

It is not a de Polignac number, because 1021161245 - 2⁸ = 1021160989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 1021161245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021161247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62999 + ... + 77531.

It is an arithmetic number, because the mean of its divisors is an integer number (43950816).

Almost surely, 2^1021161245 is an apocalyptic number.

It is an amenable number.

1021161245 is a deficient number, since it is larger than the sum of its proper divisors (385264867).

1021161245 is a wasteful number, since it uses less digits than its factorization.

1021161245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14621.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1021161245 is about 31955.6136695886. The cubic root of 1021161245 is about 1007.0045697782.

Adding to 1021161245 its reverse (5421611201), we get a palindrome (6442772446).

The spelling of 1021161245 in words is "one billion, twenty-one million, one hundred sixty-one thousand, two hundred forty-five".