21554862 has 32 divisors (see below), whose sum is σ = 49420032. Its totient is φ = 6139584.

The previous prime is 21554849. The next prime is 21554881. The reversal of 21554862 is 26845512.

It is a super-2 number, since 2×21554862² = 929224151678088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18633 + ... + 19755.

It is an arithmetic number, because the mean of its divisors is an integer number (1544376).

Almost surely, 2^21554862 is an apocalyptic number.

21554862 is an abundant number, since it is smaller than the sum of its proper divisors (27865170).

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

21554862 is a wasteful number, since it uses less digits than its factorization.

21554862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its digits is 19200, while the sum is 33.

The square root of 21554862 is about 4642.7214002135. The cubic root of 21554862 is about 278.3012021028.

The spelling of 21554862 in words is "twenty-one million, five hundred fifty-four thousand, eight hundred sixty-two".