16221948 has 12 divisors (see below), whose sum is σ = 37851240. Its totient is φ = 5407312.

The previous prime is 16221929. The next prime is 16221971. The reversal of 16221948 is 84912261.

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

It is a congruent number.

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, 675903 + ... + 675926.

It is an arithmetic number, because the mean of its divisors is an integer number (3154270).

Almost surely, 2^16221948 is an apocalyptic number.

It is an amenable number.

16221948 is an abundant number, since it is smaller than the sum of its proper divisors (21629292).

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

16221948 is a wasteful number, since it uses less digits than its factorization.

16221948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351836 (or 1351834 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 16221948 is about 4027.6479488654. The cubic root of 16221948 is about 253.1440175317.

It can be divided in two parts, 1622 and 1948, that added together give a triangular number (3570 = T₈₄).

The spelling of 16221948 in words is "sixteen million, two hundred twenty-one thousand, nine hundred forty-eight".