1021212144 has 160 divisors (see below), whose sum is σ = 3099801600. Its totient is φ = 321235200.

The previous prime is 1021212139. The next prime is 1021212149. The reversal of 1021212144 is 4412121201.

It is an interprime number because it is at equal distance from previous prime (1021212139) and next prime (1021212149).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021212149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 784294 + ... + 785594.

It is an arithmetic number, because the mean of its divisors is an integer number (19373760).

Almost surely, 2^1021212144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021212144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1549900800).

1021212144 is an abundant number, since it is smaller than the sum of its proper divisors (2078589456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021212144 is a wasteful number, since it uses less digits than its factorization.

1021212144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420 (or 1408 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1021212144 is about 31956.4100612068. The cubic root of 1021212144 is about 1007.0213006240.

Adding to 1021212144 its reverse (4412121201), we get a palindrome (5433333345).

The spelling of 1021212144 in words is "one billion, twenty-one million, two hundred twelve thousand, one hundred forty-four".