201521203315 has 16 divisors (see below), whose sum is σ = 249356747808. Its totient is φ = 156269391616.

The previous prime is 201521203309. The next prime is 201521203369. The reversal of 201521203315 is 513302125102.

It is a cyclic number.

It is not a de Polignac number, because 201521203315 - 2¹⁹ = 201520679027 is a prime.

It is a super-2 number, since 2×201521203315² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201521203315.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4559074 + ... + 4603063.

It is an arithmetic number, because the mean of its divisors is an integer number (15584796738).

Almost surely, 2^201521203315 is an apocalyptic number.

201521203315 is a deficient number, since it is larger than the sum of its proper divisors (47835544493).

201521203315 is an equidigital number, since it uses as much as digits as its factorization.

201521203315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9162278.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 201521203315 its reverse (513302125102), we get a palindrome (714823328417).

The spelling of 201521203315 in words is "two hundred one billion, five hundred twenty-one million, two hundred three thousand, three hundred fifteen".