26121921 has 16 divisors (see below), whose sum is σ = 39882624. Its totient is φ = 14897664.

The previous prime is 26121919. The next prime is 26121923. The reversal of 26121921 is 12912162.

It is an interprime number because it is at equal distance from previous prime (26121919) and next prime (26121923).

It is not a de Polignac number, because 26121921 - 2¹ = 26121919 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 26121891 and 26121900.

It is not an unprimeable number, because it can be changed into a prime (26121923) 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, 14545 + ... + 16241.

It is an arithmetic number, because the mean of its divisors is an integer number (2492664).

Almost surely, 2^26121921 is an apocalyptic number.

26121921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26121921 is a deficient number, since it is larger than the sum of its proper divisors (13760703).

26121921 is a wasteful number, since it uses less digits than its factorization.

26121921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440.

The product of its digits is 432, while the sum is 24.

The square root of 26121921 is about 5110.9608685647. The cubic root of 26121921 is about 296.7119496308.

The spelling of 26121921 in words is "twenty-six million, one hundred twenty-one thousand, nine hundred twenty-one".