1210101100021 has 16 divisors (see below), whose sum is σ = 1355946831360. Its totient is φ = 1070422683120.

The previous prime is 1210101100009. The next prime is 1210101100063. The reversal of 1210101100021 is 1200011010121.

It is a cyclic number.

It is not a de Polignac number, because 1210101100021 - 2⁵ = 1210101099989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210101099980 and 1210101100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210101100921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4739391 + ... + 4988188.

It is an arithmetic number, because the mean of its divisors is an integer number (84746676960).

Almost surely, 2^{1210101100021} is an apocalyptic number.

1210101100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210101100021 is a deficient number, since it is larger than the sum of its proper divisors (145845731339).

1210101100021 is a wasteful number, since it uses less digits than its factorization.

1210101100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9727896.

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

Adding to 1210101100021 its reverse (1200011010121), we get a palindrome (2410112110142).

The spelling of 1210101100021 in words is "one trillion, two hundred ten billion, one hundred one million, one hundred thousand, twenty-one".