21221020210101 has 8 divisors (see below), whose sum is σ = 28326810181824. Its totient is φ = 14131288522560.

The previous prime is 21221020210097. The next prime is 21221020210121. The reversal of 21221020210101 is 10101202012212.

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

It is not a de Polignac number, because 21221020210101 - 2² = 21221020210097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221020210121) 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, 4014567961 + ... + 4014573246.

It is an arithmetic number, because the mean of its divisors is an integer number (3540851272728).

Almost surely, 2^{21221020210101} is an apocalyptic number.

It is an amenable number.

21221020210101 is a deficient number, since it is larger than the sum of its proper divisors (7105789971723).

21221020210101 is an equidigital number, since it uses as much as digits as its factorization.

21221020210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029142091.

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

Adding to 21221020210101 its reverse (10101202012212), we get a palindrome (31322222222313).

The spelling of 21221020210101 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred ten thousand, one hundred one".