102022002100021 has 4 divisors (see below), whose sum is σ = 102156065178444. Its totient is φ = 101887939021600.

The previous prime is 102022002099961. The next prime is 102022002100049. The reversal of 102022002100021 is 120001200220201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45320349097521 + 56701653002500 = 6732039^2 + 7530050^2 .

It is a cyclic number.

It is not a de Polignac number, because 102022002100021 - 2¹⁵ = 102022002067253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102022002099974 and 102022002100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102022002107021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67031538070 + ... + 67031539591.

It is an arithmetic number, because the mean of its divisors is an integer number (25539016294611).

Almost surely, 2^{102022002100021} is an apocalyptic number.

It is an amenable number.

102022002100021 is a deficient number, since it is larger than the sum of its proper divisors (134063078423).

102022002100021 is an equidigital number, since it uses as much as digits as its factorization.

102022002100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134063078422.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 102022002100021 its reverse (120001200220201), we get a palindrome (222023202320222).

The spelling of 102022002100021 in words is "one hundred two trillion, twenty-two billion, two million, one hundred thousand, twenty-one".