21050241555 has 16 divisors (see below), whose sum is σ = 38491870464. Its totient is φ = 9622967520.

The previous prime is 21050241497. The next prime is 21050241559. The reversal of 21050241555 is 55514205012.

It is not a de Polignac number, because 21050241555 - 2⁸ = 21050241299 is a prime.

It is a super-2 number, since 2×21050241555² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21050241559) 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, 100239141 + ... + 100239350.

It is an arithmetic number, because the mean of its divisors is an integer number (2405741904).

Almost surely, 2^21050241555 is an apocalyptic number.

21050241555 is a deficient number, since it is larger than the sum of its proper divisors (17441628909).

21050241555 is a wasteful number, since it uses less digits than its factorization.

21050241555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200478506.

The product of its (nonzero) digits is 10000, while the sum is 30.

Adding to 21050241555 its reverse (55514205012), we get a palindrome (76564446567).

The spelling of 21050241555 in words is "twenty-one billion, fifty million, two hundred forty-one thousand, five hundred fifty-five".