7021081620 has 216 divisors, whose sum is σ = 25692829344. Its totient is φ = 1604764224.

The previous prime is 7021081619. The next prime is 7021081643. The reversal of 7021081620 is 261801207.

It is a super-2 number, since 2×7021081620² = 98591174229403648800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 223399 + ... + 252881.

It is an arithmetic number, because the mean of its divisors is an integer number (118948284).

Almost surely, 2^7021081620 is an apocalyptic number.

7021081620 is a gapful number since it is divisible by the number (70) 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 7021081620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12846414672).

7021081620 is an abundant number, since it is smaller than the sum of its proper divisors (18671747724).

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

7021081620 is a wasteful number, since it uses less digits than its factorization.

7021081620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29521 (or 29500 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 7021081620 is about 83791.8947154198. The cubic root of 7021081620 is about 1914.8496242702.

Adding to 7021081620 its reverse (261801207), we get a palindrome (7282882827).

The spelling of 7021081620 in words is "seven billion, twenty-one million, eighty-one thousand, six hundred twenty".