21197148 has 48 divisors (see below), whose sum is σ = 56792064. Its totient is φ = 6027840.

The previous prime is 21197131. The next prime is 21197153. The reversal of 21197148 is 84179112.

It is a congruent number.

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, 22813 + ... + 23723.

It is an arithmetic number, because the mean of its divisors is an integer number (1183168).

Almost surely, 2^21197148 is an apocalyptic number.

21197148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21197148 is an abundant number, since it is smaller than the sum of its proper divisors (35594916).

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

21197148 is a wasteful number, since it uses less digits than its factorization.

21197148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1200 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 21197148 is about 4604.0360554626. The cubic root of 21197148 is about 276.7530892414.

The spelling of 21197148 in words is "twenty-one million, one hundred ninety-seven thousand, one hundred forty-eight".