2155653145221 has 16 divisors (see below), whose sum is σ = 2956943283840. Its totient is φ = 1396033422080.

The previous prime is 2155653145207. The next prime is 2155653145241. The reversal of 2155653145221 is 1225413565512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2155653145221 - 2³³ = 2147063210629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155653145241) 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, 37580001 + ... + 37637318.

It is an arithmetic number, because the mean of its divisors is an integer number (184808955240).

Almost surely, 2^{2155653145221} is an apocalyptic number.

It is an amenable number.

2155653145221 is a deficient number, since it is larger than the sum of its proper divisors (801290138619).

2155653145221 is a wasteful number, since it uses less digits than its factorization.

2155653145221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75217596.

The product of its digits is 360000, while the sum is 42.

The spelling of 2155653145221 in words is "two trillion, one hundred fifty-five billion, six hundred fifty-three million, one hundred forty-five thousand, two hundred twenty-one".