21942260 has 12 divisors (see below), whose sum is σ = 46078788. Its totient is φ = 8776896.

The previous prime is 21942259. The next prime is 21942269. The reversal of 21942260 is 6224912.

It can be written as a sum of positive squares in 2 ways, for example, as 9168784 + 12773476 = 3028^2 + 3574^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21942269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548537 + ... + 548576.

It is an arithmetic number, because the mean of its divisors is an integer number (3839899).

Almost surely, 2^21942260 is an apocalyptic number.

21942260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21942260 is an abundant number, since it is smaller than the sum of its proper divisors (24136528).

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

21942260 is a wasteful number, since it uses less digits than its factorization.

21942260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097122 (or 1097120 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21942260 is about 4684.2566112458. The cubic root of 21942260 is about 279.9585823092.

The spelling of 21942260 in words is "twenty-one million, nine hundred forty-two thousand, two hundred sixty".