261426021 has 8 divisors (see below), whose sum is σ = 348663744. Its totient is φ = 174236160.

The previous prime is 261425999. The next prime is 261426041. The reversal of 261426021 is 120624162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261426021 - 2¹¹ = 261423973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261425982 and 261426000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261426041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3720 + ... + 23166.

It is an arithmetic number, because the mean of its divisors is an integer number (43582968).

Almost surely, 2^261426021 is an apocalyptic number.

It is an amenable number.

261426021 is a deficient number, since it is larger than the sum of its proper divisors (87237723).

261426021 is a wasteful number, since it uses less digits than its factorization.

261426021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23931.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 261426021 is about 16168.6740643752. The cubic root of 261426021 is about 639.4151729463.

The spelling of 261426021 in words is "two hundred sixty-one million, four hundred twenty-six thousand, twenty-one".