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21312421102 = 277320853641
BaseRepresentation
bin10011110110010100…
…011011110011101110
32001000022002011112201
4103312110123303232
5322121434433402
613442451052114
71353066406330
oct236624336356
961008064481
1021312421102
119047340465
1241695a103a
13201857147b
14106271b450
1584b0b1687
hex4f651bcee

21312421102 has 16 divisors (see below), whose sum is σ = 37036068192. Its totient is φ = 9008772480.

The previous prime is 21312421099. The next prime is 21312421129. The reversal of 21312421102 is 20112421312.

It is a self number, because there is not a number n which added to its sum of digits gives 21312421102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10425799 + ... + 10427842.

It is an arithmetic number, because the mean of its divisors is an integer number (2314754262).

Almost surely, 221312421102 is an apocalyptic number.

21312421102 is a deficient number, since it is larger than the sum of its proper divisors (15723647090).

21312421102 is a wasteful number, since it uses less digits than its factorization.

21312421102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20853723.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21312421102 its reverse (20112421312), we get a palindrome (41424842414).

The spelling of 21312421102 in words is "twenty-one billion, three hundred twelve million, four hundred twenty-one thousand, one hundred two".

Divisors: 1 2 7 14 73 146 511 1022 20853641 41707282 145975487 291950974 1522315793 3044631586 10656210551 21312421102