201621516 has 12 divisors (see below), whose sum is σ = 470450232. Its totient is φ = 67207168.

The previous prime is 201621499. The next prime is 201621527. The reversal of 201621516 is 615126102.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8400885 + ... + 8400908.

It is an arithmetic number, because the mean of its divisors is an integer number (39204186).

Almost surely, 2^201621516 is an apocalyptic number.

It is an amenable number.

201621516 is an abundant number, since it is smaller than the sum of its proper divisors (268828716).

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

201621516 is a wasteful number, since it uses less digits than its factorization.

201621516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16801800 (or 16801798 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 201621516 is about 14199.3491400134. The cubic root of 201621516 is about 586.3797427592.

Adding to 201621516 its reverse (615126102), we get a palindrome (816747618).

It can be divided in two parts, 2016 and 21516, that added together give a palindrome (23532).

The spelling of 201621516 in words is "two hundred one million, six hundred twenty-one thousand, five hundred sixteen".