21252561551151 has 16 divisors (see below), whose sum is σ = 32384920098048. Its totient is φ = 12144296736000.

The previous prime is 21252561551129. The next prime is 21252561551201. The reversal of 21252561551151 is 15115516525212.

It is not a de Polignac number, because 21252561551151 - 2¹³ = 21252561542959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252561551251) 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, 20126751 + ... + 21156351.

It is an arithmetic number, because the mean of its divisors is an integer number (2024057506128).

Almost surely, 2^{21252561551151} is an apocalyptic number.

21252561551151 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21252561551151 is a deficient number, since it is larger than the sum of its proper divisors (11132358546897).

21252561551151 is a wasteful number, since it uses less digits than its factorization.

21252561551151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012542.

The product of its digits is 150000, while the sum is 42.

The spelling of 21252561551151 in words is "twenty-one trillion, two hundred fifty-two billion, five hundred sixty-one million, five hundred fifty-one thousand, one hundred fifty-one".