7021137540 has 24 divisors (see below), whose sum is σ = 19659185280. Its totient is φ = 1872303328.

The previous prime is 7021137533. The next prime is 7021137551. The reversal of 7021137540 is 457311207.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 7021137498 and 7021137507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58509420 + ... + 58509539.

It is an arithmetic number, because the mean of its divisors is an integer number (819132720).

Almost surely, 2^7021137540 is an apocalyptic number.

It is an amenable number.

7021137540 is an abundant number, since it is smaller than the sum of its proper divisors (12638047740).

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

7021137540 is a wasteful number, since it uses less digits than its factorization.

7021137540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117018971 (or 117018969 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 7021137540 is about 83792.2283985812. The cubic root of 7021137540 is about 1914.8547079174.

Adding to 7021137540 its reverse (457311207), we get a palindrome (7478448747).

The spelling of 7021137540 in words is "seven billion, twenty-one million, one hundred thirty-seven thousand, five hundred forty".