102420131221 has 8 divisors (see below), whose sum is σ = 105106569624. Its totient is φ = 99742663680.

The previous prime is 102420131213. The next prime is 102420131239. The reversal of 102420131221 is 122131024201.

It can be written as a sum of positive squares in 4 ways, for example, as 9779034321 + 92641096900 = 98889^2 + 304370^2 .

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 102420131221 - 2³ = 102420131213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102420131201) 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, 2219580 + ... + 2265253.

It is an arithmetic number, because the mean of its divisors is an integer number (13138321203).

Almost surely, 2^102420131221 is an apocalyptic number.

It is an amenable number.

102420131221 is a deficient number, since it is larger than the sum of its proper divisors (2686438403).

102420131221 is an equidigital number, since it uses as much as digits as its factorization.

102420131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4485431.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 102420131221 its reverse (122131024201), we get a palindrome (224551155422).

The spelling of 102420131221 in words is "one hundred two billion, four hundred twenty million, one hundred thirty-one thousand, two hundred twenty-one".