61218421430 has 16 divisors (see below), whose sum is σ = 112880797344. Its totient is φ = 23890115520.

The previous prime is 61218421403. The next prime is 61218421441. The reversal of 61218421430 is 3412481216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74656202 + ... + 74657021.

It is an arithmetic number, because the mean of its divisors is an integer number (7055049834).

Almost surely, 2^61218421430 is an apocalyptic number.

61218421430 is a deficient number, since it is larger than the sum of its proper divisors (51662375914).

61218421430 is a wasteful number, since it uses less digits than its factorization.

61218421430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149313271.

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 61218421430 in words is "sixty-one billion, two hundred eighteen million, four hundred twenty-one thousand, four hundred thirty".