10221516 has 36 divisors (see below), whose sum is σ = 25935000. Its totient is φ = 3394368.

The previous prime is 10221511. The next prime is 10221517. The reversal of 10221516 is 61512201.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17680 + ... + 18248.

Almost surely, 2^10221516 is an apocalyptic number.

It is an amenable number.

10221516 is an abundant number, since it is smaller than the sum of its proper divisors (15713484).

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

10221516 is a wasteful number, since it uses less digits than its factorization.

10221516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 10221516 is about 3197.1105704996. The cubic root of 10221516 is about 217.0226710087.

Adding to 10221516 its reverse (61512201), we get a palindrome (71733717).

The spelling of 10221516 in words is "ten million, two hundred twenty-one thousand, five hundred sixteen".