102426221 has 4 divisors (see below), whose sum is σ = 103440444. Its totient is φ = 101412000.

The previous prime is 102426211. The next prime is 102426229. The reversal of 102426221 is 122624201.

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 2 ways, for example, as 99720196 + 2706025 = 9986^2 + 1645^2 .

It is a cyclic number.

It is not a de Polignac number, because 102426221 - 2¹⁴ = 102409837 is a prime.

It is a super-2 number, since 2×102426221² = 20982261496681682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102426193 and 102426202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102426229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506960 + ... + 507161.

It is an arithmetic number, because the mean of its divisors is an integer number (25860111).

Almost surely, 2^102426221 is an apocalyptic number.

It is an amenable number.

102426221 is a deficient number, since it is larger than the sum of its proper divisors (1014223).

102426221 is a wasteful number, since it uses less digits than its factorization.

102426221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014222.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 102426221 is about 10120.5840246500. The cubic root of 102426221 is about 467.8827673463.

The spelling of 102426221 in words is "one hundred two million, four hundred twenty-six thousand, two hundred twenty-one".