1021016620 has 96 divisors (see below), whose sum is σ = 2404233216. Its totient is φ = 361670400.

The previous prime is 1021016611. The next prime is 1021016641. The reversal of 1021016620 is 266101201.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1055377 + ... + 1056343.

It is an arithmetic number, because the mean of its divisors is an integer number (25044096).

Almost surely, 2^1021016620 is an apocalyptic number.

1021016620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021016620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1202116608).

1021016620 is an abundant number, since it is smaller than the sum of its proper divisors (1383216596).

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

1021016620 is a wasteful number, since it uses less digits than its factorization.

1021016620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151 (or 1149 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1021016620 is about 31953.3506850221. The cubic root of 1021016620 is about 1006.9570275274.

Adding to 1021016620 its reverse (266101201), we get a palindrome (1287117821).

The spelling of 1021016620 in words is "one billion, twenty-one million, sixteen thousand, six hundred twenty".