215152522020 has 72 divisors (see below), whose sum is σ = 652672742904. Its totient is φ = 57370188288.

The previous prime is 215152521959. The next prime is 215152522021. The reversal of 215152522020 is 20225251512.

It is a happy number.

215152522020 is a `hidden beast` number, since 21 + 51 + 52 + 522 + 0 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19441840356 + 195710681664 = 139434^2 + 442392^2 .

It is not an unprimeable number, because it can be changed into a prime (215152522021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3591352 + ... + 3650768.

It is an arithmetic number, because the mean of its divisors is an integer number (9064899207).

Almost surely, 2^215152522020 is an apocalyptic number.

215152522020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215152522020 is an abundant number, since it is smaller than the sum of its proper divisors (437520220884).

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

215152522020 is a wasteful number, since it uses less digits than its factorization.

215152522020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79549 (or 79544 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 215152522020 its reverse (20225251512), we get a palindrome (235377773532).

The spelling of 215152522020 in words is "two hundred fifteen billion, one hundred fifty-two million, five hundred twenty-two thousand, twenty".