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102212121 = 31113922283
BaseRepresentation
bin1100001011110…
…10001000011001
321010022220200010
412011322020121
5202131241441
614050432133
72350534344
oct605721031
9233286603
10102212121
1152772530
122a292649
131823965b
14d80945b
158e90116
hex617a219

102212121 has 16 divisors (see below), whose sum is σ = 149748480. Its totient is φ = 61498320.

The previous prime is 102212119. The next prime is 102212129. The reversal of 102212121 is 121212201.

It is not a de Polignac number, because 102212121 - 21 = 102212119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102212097 and 102212106.

It is not an unprimeable number, because it can be changed into a prime (102212129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6555 + ... + 15728.

It is an arithmetic number, because the mean of its divisors is an integer number (9359280).

Almost surely, 2102212121 is an apocalyptic number.

102212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102212121 is a deficient number, since it is larger than the sum of its proper divisors (47536359).

102212121 is a wasteful number, since it uses less digits than its factorization.

102212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22436.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 102212121 is about 10110.0010385756. The cubic root of 102212121 is about 467.5565371490.

Adding to 102212121 its reverse (121212201), we get a palindrome (223424322).

The spelling of 102212121 in words is "one hundred two million, two hundred twelve thousand, one hundred twenty-one".

Divisors: 1 3 11 33 139 417 1529 4587 22283 66849 245113 735339 3097337 9292011 34070707 102212121