21021212020101 has 8 divisors (see below), whose sum is σ = 28028305174464. Its totient is φ = 14014130106240.

The previous prime is 21021212020063. The next prime is 21021212020139. The reversal of 21021212020101 is 10102021212012.

It is an interprime number because it is at equal distance from previous prime (21021212020063) and next prime (21021212020139).

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

It is not a de Polignac number, because 21021212020101 - 2⁹ = 21021212019589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021212020001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3723925 + ... + 7477301.

It is an arithmetic number, because the mean of its divisors is an integer number (3503538146808).

Almost surely, 2^{21021212020101} is an apocalyptic number.

It is an amenable number.

21021212020101 is a deficient number, since it is larger than the sum of its proper divisors (7007093154363).

21021212020101 is a wasteful number, since it uses less digits than its factorization.

21021212020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5620251.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021212020101 its reverse (10102021212012), we get a palindrome (31123233232113).

The spelling of 21021212020101 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, twenty thousand, one hundred one".