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21121998 = 233520333
BaseRepresentation
bin101000010010…
…0101111001110
31110202002221020
41100210233032
520401400443
62032415010
7344351112
oct120445716
943662836
1021121998
1110a172a7
1270a7466
1344b7031
142b3b742
151cc3583
hex1424bce

21121998 has 8 divisors (see below), whose sum is σ = 42244008. Its totient is φ = 7040664.

The previous prime is 21121979. The next prime is 21121999. The reversal of 21121998 is 89912112.

It is a sphenic number, since it is the product of 3 distinct primes.

21121998 is an admirable number.

It is a super-2 number, since 2×211219982 = 892277599024008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121999) 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, 1760161 + ... + 1760172.

It is an arithmetic number, because the mean of its divisors is an integer number (5280501).

Almost surely, 221121998 is an apocalyptic number.

21121998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21121998 is a wasteful number, since it uses less digits than its factorization.

21121998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520338.

The product of its digits is 2592, while the sum is 33.

The square root of 21121998 is about 4595.8674915624. The cubic root of 21121998 is about 276.4256454822.

The spelling of 21121998 in words is "twenty-one million, one hundred twenty-one thousand, nine hundred ninety-eight".

Divisors: 1 2 3 6 3520333 7040666 10560999 21121998