21019292 has 24 divisors (see below), whose sum is σ = 42236544. Its totient is φ = 8965872.

The previous prime is 21019291. The next prime is 21019331. The reversal of 21019292 is 29291012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21019291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4703 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (1759856).

Almost surely, 2^21019292 is an apocalyptic number.

It is an amenable number.

21019292 is an abundant number, since it is smaller than the sum of its proper divisors (21217252).

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

21019292 is a wasteful number, since it uses less digits than its factorization.

21019292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545 (or 3543 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21019292 is about 4584.6801415148. The cubic root of 21019292 is about 275.9768761695.

The spelling of 21019292 in words is "twenty-one million, nineteen thousand, two hundred ninety-two".