1621106055 has 40 divisors (see below), whose sum is σ = 2934828864. Its totient is φ = 856008000.

The previous prime is 1621106051. The next prime is 1621106057. The reversal of 1621106055 is 5506011261.

It is a happy number.

It is not a de Polignac number, because 1621106055 - 2² = 1621106051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621106051) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21090 + ... + 60720.

Almost surely, 2^1621106055 is an apocalyptic number.

1621106055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1621106055 is a deficient number, since it is larger than the sum of its proper divisors (1313722809).

1621106055 is a wasteful number, since it uses less digits than its factorization.

1621106055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39749 (or 39740 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1621106055 is about 40262.9613292415. The cubic root of 1621106055 is about 1174.7275191317.

The spelling of 1621106055 in words is "one billion, six hundred twenty-one million, one hundred six thousand, fifty-five".