21101000021010 has 216 divisors, whose sum is σ = 69106605649380. Its totient is φ = 4452078968064.

The previous prime is 21101000021009. The next prime is 21101000021021. The reversal of 21101000021010 is 1012000010112.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1693071994761 + 19407928026249 = 1301181^2 + 4405443^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21101000020983 and 21101000021001.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 13410945 + ... + 14901524.

Almost surely, 2^{21101000021010} is an apocalyptic number.

21101000021010 is an abundant number, since it is smaller than the sum of its proper divisors (48005605628370).

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

21101000021010 is a wasteful number, since it uses less digits than its factorization.

21101000021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28312522 (or 28312499 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21101000021010 its reverse (1012000010112), we get a palindrome (22113000031122).

The spelling of 21101000021010 in words is "twenty-one trillion, one hundred one billion, twenty-one thousand, ten".