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20121221210 = 2514401139721
BaseRepresentation
bin10010101111010100…
…010111100001011010
31220221021121221111012
4102233110113201122
5312202013034320
613124335333522
71311423362336
oct225724274132
956837557435
1020121221210
1185959a5342
123a966812a2
131b8883b66c
14d8c43c7c6
157cb7134c5
hex4af51785a

20121221210 has 16 divisors (see below), whose sum is σ = 36220972392. Its totient is φ = 8047872000.

The previous prime is 20121221161. The next prime is 20121221249. The reversal of 20121221210 is 1212212102.

It can be written as a sum of positive squares in 4 ways, for example, as 19979539801 + 141681409 = 141349^2 + 11903^2 .

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, 74150 + ... + 213870.

Almost surely, 220121221210 is an apocalyptic number.

20121221210 is a deficient number, since it is larger than the sum of its proper divisors (16099751182).

20121221210 is a wasteful number, since it uses less digits than its factorization.

20121221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154129.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20121221210 its reverse (1212212102), we get a palindrome (21333433312).

The spelling of 20121221210 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred ten".

Divisors: 1 2 5 10 14401 28802 72005 139721 144010 279442 698605 1397210 2012122121 4024244242 10060610605 20121221210