21250241126556 has 48 divisors (see below), whose sum is σ = 53400347511168. Its totient is φ = 6538253400000.

The previous prime is 21250241126537. The next prime is 21250241126561. The reversal of 21250241126556 is 65562114205212.

It is a super-2 number, since 2×21250241126556² (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 15 ways as a sum of consecutive naturals, for example, 697831 + ... + 6556481.

It is an arithmetic number, because the mean of its divisors is an integer number (1112507239816).

Almost surely, 2^{21250241126556} is an apocalyptic number.

21250241126556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21250241126556 is an abundant number, since it is smaller than the sum of its proper divisors (32150106384612).

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

21250241126556 is a wasteful number, since it uses less digits than its factorization.

21250241126556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881922 (or 5881920 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 21250241126556 in words is "twenty-one trillion, two hundred fifty billion, two hundred forty-one million, one hundred twenty-six thousand, five hundred fifty-six".