26198400921 has 32 divisors (see below), whose sum is σ = 43973449728. Its totient is φ = 13477415040.

The previous prime is 26198400913. The next prime is 26198400947. The reversal of 26198400921 is 12900489162.

It is not a de Polignac number, because 26198400921 - 2³ = 26198400913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26198400911) 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, 526756 + ... + 574341.

It is an arithmetic number, because the mean of its divisors is an integer number (1374170304).

Almost surely, 2^26198400921 is an apocalyptic number.

26198400921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26198400921 is a deficient number, since it is larger than the sum of its proper divisors (17775048807).

26198400921 is a wasteful number, since it uses less digits than its factorization.

26198400921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101221.

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 26198400921 in words is "twenty-six billion, one hundred ninety-eight million, four hundred thousand, nine hundred twenty-one".