101210021 has 8 divisors (see below), whose sum is σ = 110484000. Its totient is φ = 91948240.

The previous prime is 101209991. The next prime is 101210077. The reversal of 101210021 is 120012101.

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

It is a cyclic number.

It is not a de Polignac number, because 101210021 - 2¹⁴ = 101193637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101209990 and 101210008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101210621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29030 + ... + 32328.

It is an arithmetic number, because the mean of its divisors is an integer number (13810500).

Almost surely, 2^101210021 is an apocalyptic number.

101210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101210021 is a deficient number, since it is larger than the sum of its proper divisors (9273979).

101210021 is a wasteful number, since it uses less digits than its factorization.

101210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6099.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 101210021 is about 10060.3191301270. The cubic root of 101210021 is about 466.0235226081.

Adding to 101210021 its reverse (120012101), we get a palindrome (221222122).

The spelling of 101210021 in words is "one hundred one million, two hundred ten thousand, twenty-one".