1621020013 has 8 divisors (see below), whose sum is σ = 1696945536. Its totient is φ = 1545548400.

The previous prime is 1621020007. The next prime is 1621020019. The reversal of 1621020013 is 3100201261.

It is an interprime number because it is at equal distance from previous prime (1621020007) and next prime (1621020019).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1621020013 - 2²¹ = 1618922861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621020019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106158 + ... + 120463.

It is an arithmetic number, because the mean of its divisors is an integer number (212118192).

Almost surely, 2^1621020013 is an apocalyptic number.

It is an amenable number.

1621020013 is a deficient number, since it is larger than the sum of its proper divisors (75925523).

1621020013 is a wasteful number, since it uses less digits than its factorization.

1621020013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226955.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1621020013 is about 40261.8928144219. The cubic root of 1621020013 is about 1174.7067354425.

Adding to 1621020013 its reverse (3100201261), we get a palindrome (4721221274).

The spelling of 1621020013 in words is "one billion, six hundred twenty-one million, twenty thousand, thirteen".