61010506021 has 4 divisors (see below), whose sum is σ = 61011017344. Its totient is φ = 61009994700.

The previous prime is 61010506001. The next prime is 61010506121. The reversal of 61010506021 is 12060501016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61010506021 - 2¹¹ = 61010503973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61010505983 and 61010506001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61010506001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28876 + ... + 350506.

It is an arithmetic number, because the mean of its divisors is an integer number (15252754336).

Almost surely, 2^61010506021 is an apocalyptic number.

It is an amenable number.

61010506021 is a deficient number, since it is larger than the sum of its proper divisors (511323).

61010506021 is a wasteful number, since it uses less digits than its factorization.

61010506021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511322.

The product of its (nonzero) digits is 360, while the sum is 22.

The spelling of 61010506021 in words is "sixty-one billion, ten million, five hundred six thousand, twenty-one".