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BaseRepresentation
bin101000010010…
…0100010110010
31110202001211202
41100210202302
520401334302
62032411202
7344345564
oct120444262
943661752
1021121202
1110a16743
1270a6b02
1344b686b
142b3b334
151cc3202
hex14248b2

21121202 has 4 divisors (see below), whose sum is σ = 31681806. Its totient is φ = 10560600.

The previous prime is 21121201. The next prime is 21121207. The reversal of 21121202 is 20212112.

Adding to 21121202 its reverse (20212112), we get a palindrome (41333314).

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 8934121 = 3491^2 + 2989^2 .

It is a super-2 number, since 2×211212022 = 892210347849608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280299 + ... + 5280302.

Almost surely, 221121202 is an apocalyptic number.

21121202 is a deficient number, since it is larger than the sum of its proper divisors (10560604).

21121202 is a wasteful number, since it uses less digits than its factorization.

21121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560603.

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

The square root of 21121202 is about 4595.7808912088. The cubic root of 21121202 is about 276.4221729954.

The spelling of 21121202 in words is "twenty-one million, one hundred twenty-one thousand, two hundred two".

Divisors: 1 2 10560601 21121202