421020201025 has 6 divisors (see below), whose sum is σ = 522065049302. Its totient is φ = 336816160800.

The previous prime is 421020201023. The next prime is 421020201127. The reversal of 421020201025 is 520102020124.

It can be written as a sum of positive squares in 3 ways, for example, as 128629105201 + 292391095824 = 358649^2 + 540732^2 .

It is not a de Polignac number, because 421020201025 - 2¹ = 421020201023 is a prime.

It is a super-2 number, since 2×421020201025² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421020200993 and 421020201011.

It is not an unprimeable number, because it can be changed into a prime (421020201023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8420403996 + ... + 8420404045.

Almost surely, 2^421020201025 is an apocalyptic number.

It is an amenable number.

421020201025 is a deficient number, since it is larger than the sum of its proper divisors (101044848277).

421020201025 is a wasteful number, since it uses less digits than its factorization.

421020201025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16840808051 (or 16840808046 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 421020201025 its reverse (520102020124), we get a palindrome (941122221149).

The spelling of 421020201025 in words is "four hundred twenty-one billion, twenty million, two hundred one thousand, twenty-five".