212121101021010 has 32 divisors (see below), whose sum is σ = 535884886791360. Its totient is φ = 53588488678848.

The previous prime is 212121101021009. The next prime is 212121101021023. The reversal of 212121101021010 is 10120101121212.

It is a happy number.

It is a super-3 number, since 3×212121101021010³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186071140677 + ... + 186071141816.

It is an arithmetic number, because the mean of its divisors is an integer number (16746402712230).

Almost surely, 2^{212121101021010} is an apocalyptic number.

212121101021010 is an abundant number, since it is smaller than the sum of its proper divisors (323763785770350).

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

212121101021010 is a wasteful number, since it uses less digits than its factorization.

212121101021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372142282522.

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

Adding to 212121101021010 its reverse (10120101121212), we get a palindrome (222241202142222).

The spelling of 212121101021010 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred one million, twenty-one thousand, ten".