201021250605 has 32 divisors (see below), whose sum is σ = 374517229824. Its totient is φ = 90161550336.

The previous prime is 201021250597. The next prime is 201021250709. The reversal of 201021250605 is 506052120102.

It is a happy number.

It is not a de Polignac number, because 201021250605 - 2³ = 201021250597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18055644 + ... + 18066773.

It is an arithmetic number, because the mean of its divisors is an integer number (11703663432).

Almost surely, 2^201021250605 is an apocalyptic number.

It is an amenable number.

201021250605 is a deficient number, since it is larger than the sum of its proper divisors (173495979219).

201021250605 is a wasteful number, since it uses less digits than its factorization.

201021250605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36122485.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 201021250605 its reverse (506052120102), we get a palindrome (707073370707).

The spelling of 201021250605 in words is "two hundred one billion, twenty-one million, two hundred fifty thousand, six hundred five".