612120621 has 16 divisors (see below), whose sum is σ = 952602624. Its totient is φ = 342340464.

The previous prime is 612120589. The next prime is 612120659. The reversal of 612120621 is 126021216.

It is not a de Polignac number, because 612120621 - 2⁵ = 612120589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612120671) 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, 309105 + ... + 311078.

It is an arithmetic number, because the mean of its divisors is an integer number (59537664).

Almost surely, 2^612120621 is an apocalyptic number.

It is an amenable number.

612120621 is a deficient number, since it is larger than the sum of its proper divisors (340482003).

612120621 is a wasteful number, since it uses less digits than its factorization.

612120621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620240.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 612120621 is about 24741.0715410631. The cubic root of 612120621 is about 849.0742497850.

Adding to 612120621 its reverse (126021216), we get a palindrome (738141837).

The spelling of 612120621 in words is "six hundred twelve million, one hundred twenty thousand, six hundred twenty-one".