21153434515226 has 16 divisors (see below), whose sum is σ = 34420355550504. Its totient is φ = 9691859944704.

The previous prime is 21153434515219. The next prime is 21153434515231. The reversal of 21153434515226 is 62251543435112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10420636066201 + 10732798449025 = 3228101^2 + 3276095^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2969316275 + ... + 2969323398.

Almost surely, 2^{21153434515226} is an apocalyptic number.

21153434515226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21153434515226 is a deficient number, since it is larger than the sum of its proper divisors (13266921035278).

21153434515226 is a wasteful number, since it uses less digits than its factorization.

21153434515226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5938639825.

The product of its digits is 864000, while the sum is 44.

The spelling of 21153434515226 in words is "twenty-one trillion, one hundred fifty-three billion, four hundred thirty-four million, five hundred fifteen thousand, two hundred twenty-six".