1021220512 has 96 divisors (see below), whose sum is σ = 2328480000. Its totient is φ = 436866048.

The previous prime is 1021220509. The next prime is 1021220513. The reversal of 1021220512 is 2150221201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1021220513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370114 + ... + 372862.

It is an arithmetic number, because the mean of its divisors is an integer number (24255000).

Almost surely, 2^1021220512 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 1021220512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1164240000).

1021220512 is an abundant number, since it is smaller than the sum of its proper divisors (1307259488).

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

1021220512 is a wasteful number, since it uses less digits than its factorization.

1021220512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838 (or 2830 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1021220512 is about 31956.5409892873. The cubic root of 1021220512 is about 1007.0240511890.

Adding to 1021220512 its reverse (2150221201), we get a palindrome (3171441713).

The spelling of 1021220512 in words is "one billion, twenty-one million, two hundred twenty thousand, five hundred twelve".