21101121010 has 32 divisors (see below), whose sum is σ = 38477122992. Its totient is φ = 8330895360.

The previous prime is 21101120939. The next prime is 21101121029. The reversal of 21101121010 is 1012110112.

It can be written as a sum of positive squares in 8 ways, for example, as 2812074841 + 18289046169 = 53029^2 + 135237^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 332650 + ... + 390970.

Almost surely, 2^21101121010 is an apocalyptic number.

21101121010 is a deficient number, since it is larger than the sum of its proper divisors (17376001982).

21101121010 is a wasteful number, since it uses less digits than its factorization.

21101121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58798.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21101121010 its reverse (1012110112), we get a palindrome (22113231122).

The spelling of 21101121010 in words is "twenty-one billion, one hundred one million, one hundred twenty-one thousand, ten".