21121034510 has 16 divisors (see below), whose sum is σ = 38020383072. Its totient is φ = 8447853600.

The previous prime is 21121034477. The next prime is 21121034521. The reversal of 21121034510 is 1543012112.

It is a super-2 number, since 2×21121034510² (a number of 21 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 7 ways as a sum of consecutive naturals, for example, 110480 + ... + 233340.

It is an arithmetic number, because the mean of its divisors is an integer number (2376273942).

Almost surely, 2^21121034510 is an apocalyptic number.

21121034510 is a deficient number, since it is larger than the sum of its proper divisors (16899348562).

21121034510 is a wasteful number, since it uses less digits than its factorization.

21121034510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140059.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21121034510 its reverse (1543012112), we get a palindrome (22664046622).

The spelling of 21121034510 in words is "twenty-one billion, one hundred twenty-one million, thirty-four thousand, five hundred ten".