206102421 has 32 divisors (see below), whose sum is σ = 353894400. Its totient is φ = 116106480.

The previous prime is 206102417. The next prime is 206102423. The reversal of 206102421 is 124201602.

It is not a de Polignac number, because 206102421 - 2² = 206102417 is a prime.

It is a super-2 number, since 2×206102421² = 84956415884122482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206102394 and 206102403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206102423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5740 + ... + 21098.

It is an arithmetic number, because the mean of its divisors is an integer number (11059200).

Almost surely, 2^206102421 is an apocalyptic number.

206102421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

206102421 is a deficient number, since it is larger than the sum of its proper divisors (147791979).

206102421 is a wasteful number, since it uses less digits than its factorization.

206102421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15446 (or 15440 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 206102421 is about 14356.2676556269. The cubic root of 206102421 is about 590.6919211650.

The spelling of 206102421 in words is "two hundred six million, one hundred two thousand, four hundred twenty-one".