135552201621 has 16 divisors (see below), whose sum is σ = 187140058560. Its totient is φ = 87171956480.

The previous prime is 135552201611. The next prime is 135552201641. The reversal of 135552201621 is 126102255531.

It is a cyclic number.

It is not a de Polignac number, because 135552201621 - 2¹⁸ = 135551939477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135552201611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619140 + ... + 808973.

It is an arithmetic number, because the mean of its divisors is an integer number (11696253660).

Almost surely, 2^135552201621 is an apocalyptic number.

It is an amenable number.

135552201621 is a deficient number, since it is larger than the sum of its proper divisors (51587856939).

135552201621 is a wasteful number, since it uses less digits than its factorization.

135552201621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429236.

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 135552201621 in words is "one hundred thirty-five billion, five hundred fifty-two million, two hundred one thousand, six hundred twenty-one".