21131365006254 has 256 divisors, whose sum is σ = 45944773136640. Its totient is φ = 6467561717760.

The previous prime is 21131365006189. The next prime is 21131365006277. The reversal of 21131365006254 is 45260056313112.

It is a happy number.

It is a super-2 number, since 2×21131365006254² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 24772994892 + ... + 24772995744.

It is an arithmetic number, because the mean of its divisors is an integer number (179471770065).

Almost surely, 2^{21131365006254} is an apocalyptic number.

21131365006254 is an abundant number, since it is smaller than the sum of its proper divisors (24813408130386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131365006254 is a wasteful number, since it uses less digits than its factorization.

21131365006254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 21131365006254 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred sixty-five million, six thousand, two hundred fifty-four".