21020101021212 has 24 divisors (see below), whose sum is σ = 49099697782800. Its totient is φ = 6999158140416.

The previous prime is 21020101021111. The next prime is 21020101021279. The reversal of 21020101021212 is 21212010102012.

It is a junction number, because it is equal to n+sod(n) for n = 21020101021191 and 21020101021200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942763387 + ... + 942785682.

It is an arithmetic number, because the mean of its divisors is an integer number (2045820740950).

Almost surely, 2^{21020101021212} is an apocalyptic number.

It is an amenable number.

21020101021212 is an abundant number, since it is smaller than the sum of its proper divisors (28079596761588).

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

21020101021212 is a wasteful number, since it uses less digits than its factorization.

21020101021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885550005 (or 1885550003 counting only the distinct ones).

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

Adding to 21020101021212 its reverse (21212010102012), we get a palindrome (42232111123224).

The spelling of 21020101021212 in words is "twenty-one trillion, twenty billion, one hundred one million, twenty-one thousand, two hundred twelve".