101211220021 has 16 divisors (see below), whose sum is σ = 105974863488. Its totient is φ = 96478412800.

The previous prime is 101211220007. The next prime is 101211220039. The reversal of 101211220021 is 120022112101.

It is not a de Polignac number, because 101211220021 - 2²³ = 101202831413 is a prime.

It is a super-2 number, since 2×101211220021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101211219983 and 101211220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211220051) 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, 8588085 + ... + 8599861.

It is an arithmetic number, because the mean of its divisors is an integer number (6623428968).

Almost surely, 2^101211220021 is an apocalyptic number.

It is an amenable number.

101211220021 is a deficient number, since it is larger than the sum of its proper divisors (4763643467).

101211220021 is a wasteful number, since it uses less digits than its factorization.

101211220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13052.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101211220021 its reverse (120022112101), we get a palindrome (221233332122).

The spelling of 101211220021 in words is "one hundred one billion, two hundred eleven million, two hundred twenty thousand, twenty-one".