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202120121 = 7199373389
BaseRepresentation
bin11000000110000…
…01101110111001
3112002022202200102
430003001232321
5403220320441
632020045145
75002664330
oct1403015671
9462282612
10202120121
11a4100925
12578337b5
1332b4a308
141cbb4d17
1512b2769b
hexc0c1bb9

202120121 has 16 divisors (see below), whose sum is σ = 233376000. Its totient is φ = 171471168.

The previous prime is 202120109. The next prime is 202120129. The reversal of 202120121 is 121021202.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-202120121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202120129) by changing a digit.

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, 519395 + ... + 519783.

It is an arithmetic number, because the mean of its divisors is an integer number (14586000).

Almost surely, 2202120121 is an apocalyptic number.

It is an amenable number.

202120121 is a deficient number, since it is larger than the sum of its proper divisors (31255879).

202120121 is a wasteful number, since it uses less digits than its factorization.

202120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 202120121 is about 14216.8956175390. The cubic root of 202120121 is about 586.8627123657.

Adding to 202120121 its reverse (121021202), we get a palindrome (323141323).

The spelling of 202120121 in words is "two hundred two million, one hundred twenty thousand, one hundred twenty-one".

Divisors: 1 7 199 373 389 1393 2611 2723 74227 77411 145097 519589 541877 1015679 28874303 202120121