101220212121 has 16 divisors (see below), whose sum is σ = 154247639424. Its totient is φ = 57837377664.

The previous prime is 101220212111. The next prime is 101220212143. The reversal of 101220212121 is 121212022101.

It is not a de Polignac number, because 101220212121 - 2⁷ = 101220211993 is a prime.

101220212121 is a modest number, since divided by 212121 gives 101220 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 101220212121.

It is not an unprimeable number, because it can be changed into a prime (101220212111) 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, 390871 + ... + 596003.

It is an arithmetic number, because the mean of its divisors is an integer number (9640477464).

Almost surely, 2^101220212121 is an apocalyptic number.

It is an amenable number.

101220212121 is a deficient number, since it is larger than the sum of its proper divisors (53027427303).

101220212121 is a wasteful number, since it uses less digits than its factorization.

101220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228640.

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

Adding to 101220212121 its reverse (121212022101), we get a palindrome (222432234222).

The spelling of 101220212121 in words is "one hundred one billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".