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BaseRepresentation
bin100110100011…
…0000111001001
31102000210002000
41031012013021
520133210441
62001101213
7333532431
oct115060711
942023060
1020210121
1110454188
126927809
134257c69
1429812c1
151b932b6
hex13461c9

20210121 has 8 divisors (see below), whose sum is σ = 29940960. Its totient is φ = 13473396.

The previous prime is 20210107. The next prime is 20210131. The reversal of 20210121 is 12101202.

It is not a de Polignac number, because 20210121 - 27 = 20209993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20210101) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 374235 + ... + 374288.

It is an arithmetic number, because the mean of its divisors is an integer number (3742620).

Almost surely, 220210121 is an apocalyptic number.

It is an amenable number.

20210121 is a deficient number, since it is larger than the sum of its proper divisors (9730839).

20210121 is an equidigital number, since it uses as much as digits as its factorization.

20210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748532 (or 748526 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20210121 is about 4495.5668163203. The cubic root of 20210121 is about 272.3890455336.

Adding to 20210121 its reverse (12101202), we get a palindrome (32311323).

The spelling of 20210121 in words is "twenty million, two hundred ten thousand, one hundred twenty-one".

Divisors: 1 3 9 27 748523 2245569 6736707 20210121