61221141437 has 4 divisors (see below), whose sum is σ = 61310777760. Its totient is φ = 61131505116.

The previous prime is 61221141407. The next prime is 61221141451. The reversal of 61221141437 is 73414112216.

61221141437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 61221141437 - 2²⁶ = 61154032573 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 (61221141407) 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, 44817137 + ... + 44818502.

It is an arithmetic number, because the mean of its divisors is an integer number (15327694440).

Almost surely, 2^61221141437 is an apocalyptic number.

It is an amenable number.

61221141437 is a deficient number, since it is larger than the sum of its proper divisors (89636323).

61221141437 is an equidigital number, since it uses as much as digits as its factorization.

61221141437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89636322.

The product of its digits is 8064, while the sum is 32.

The spelling of 61221141437 in words is "sixty-one billion, two hundred twenty-one million, one hundred forty-one thousand, four hundred thirty-seven".