21121320010 has 16 divisors (see below), whose sum is σ = 43449572736. Its totient is φ = 7241595408.

The previous prime is 21121320001. The next prime is 21121320071. The reversal of 21121320010 is 1002312112.

It is a super-2 number, since 2×21121320010² (a number of 21 digits) contains 22 as substring.

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, 150866502 + ... + 150866641.

It is an arithmetic number, because the mean of its divisors is an integer number (2715598296).

Almost surely, 2^21121320010 is an apocalyptic number.

21121320010 is an abundant number, since it is smaller than the sum of its proper divisors (22328252726).

21121320010 is a wasteful number, since it uses less digits than its factorization.

21121320010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301733157.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21121320010 its reverse (1002312112), we get a palindrome (22123632122).

The spelling of 21121320010 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, ten".