21101001010 has 8 divisors (see below), whose sum is σ = 37981801836. Its totient is φ = 8440400400.

The previous prime is 21101000993. The next prime is 21101001013. The reversal of 21101001010 is 1010010112.

It can be written as a sum of positive squares in 2 ways, for example, as 20993401881 + 107599129 = 144891^2 + 10373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21101000984 and 21101001002.

It is not an unprimeable number, because it can be changed into a prime (21101001013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055050041 + ... + 1055050060.

Almost surely, 2^21101001010 is an apocalyptic number.

21101001010 is a deficient number, since it is larger than the sum of its proper divisors (16880800826).

21101001010 is a wasteful number, since it uses less digits than its factorization.

21101001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110100108.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21101001010 its reverse (1010010112), we get a palindrome (22111011122).

The spelling of 21101001010 in words is "twenty-one billion, one hundred one million, one thousand, ten".