21105104010 has 16 divisors (see below), whose sum is σ = 50652249696. Its totient is φ = 5628027728.

The previous prime is 21105103997. The next prime is 21105104023. The reversal of 21105104010 is 1040150112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21105103997) and next prime (21105104023).

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 351751704 + ... + 351751763.

It is an arithmetic number, because the mean of its divisors is an integer number (3165765606).

Almost surely, 2^21105104010 is an apocalyptic number.

21105104010 is an abundant number, since it is smaller than the sum of its proper divisors (29547145686).

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

21105104010 is a wasteful number, since it uses less digits than its factorization.

21105104010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703503477.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 21105104010 its reverse (1040150112), we get a palindrome (22145254122).

The spelling of 21105104010 in words is "twenty-one billion, one hundred five million, one hundred four thousand, ten".