21087462 has 32 divisors (see below), whose sum is σ = 46212480. Its totient is φ = 6361920.

The previous prime is 21087457. The next prime is 21087491. The reversal of 21087462 is 26478012.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18114 + ... + 19242.

It is an arithmetic number, because the mean of its divisors is an integer number (1444140).

Almost surely, 2^21087462 is an apocalyptic number.

21087462 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21087462 is an abundant number, since it is smaller than the sum of its proper divisors (25125018).

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

21087462 is a wasteful number, since it uses less digits than its factorization.

21087462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 21087462 is about 4592.1086659616. The cubic root of 21087462 is about 276.2749046294.

The spelling of 21087462 in words is "twenty-one million, eighty-seven thousand, four hundred sixty-two".