10101212121021 has 32 divisors (see below), whose sum is σ = 15930335428608. Its totient is φ = 5571338958720.

The previous prime is 10101212121017. The next prime is 10101212121023. The reversal of 10101212121021 is 12012121210101.

It is a happy number.

It is not a de Polignac number, because 10101212121021 - 2² = 10101212121017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101212121023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20007136 + ... + 20505801.

It is an arithmetic number, because the mean of its divisors is an integer number (497822982144).

Almost surely, 2^{10101212121021} is an apocalyptic number.

It is an amenable number.

10101212121021 is a deficient number, since it is larger than the sum of its proper divisors (5829123307587).

10101212121021 is a wasteful number, since it uses less digits than its factorization.

10101212121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40513361.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 10101212121021 its reverse (12012121210101), we get a palindrome (22113333331122).

The spelling of 10101212121021 in words is "ten trillion, one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".