102020421 has 8 divisors (see below), whose sum is σ = 136209024. Its totient is φ = 67922720.

The previous prime is 102020419. The next prime is 102020447. The reversal of 102020421 is 124020201.

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 102020421 - 2¹ = 102020419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102020397 and 102020406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020461) 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, 20061 + ... + 24626.

It is an arithmetic number, because the mean of its divisors is an integer number (17026128).

Almost surely, 2^102020421 is an apocalyptic number.

It is an amenable number.

102020421 is a deficient number, since it is larger than the sum of its proper divisors (34188603).

102020421 is an equidigital number, since it uses as much as digits as its factorization.

102020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45451.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 102020421 is about 10100.5158779144. The cubic root of 102020421 is about 467.2640516781.

Adding to 102020421 its reverse (124020201), we get a palindrome (226040622).

The spelling of 102020421 in words is "one hundred two million, twenty thousand, four hundred twenty-one".