61521421410 has 48 divisors (see below), whose sum is σ = 159997326840. Its totient is φ = 16401442560.

The previous prime is 61521421399. The next prime is 61521421421. The reversal of 61521421410 is 1412412516.

61521421410 is a `hidden beast` number, since 6 + 15 + 214 + 21 + 410 = 666.

61521421410 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61521421399) and next prime (61521421421).

It can be written as a sum of positive squares in 4 ways, for example, as 42036890841 + 19484530569 = 205029^2 + 139587^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266620 + ... + 440600.

Almost surely, 2^61521421410 is an apocalyptic number.

61521421410 is an abundant number, since it is smaller than the sum of its proper divisors (98475905430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61521421410 is a wasteful number, since it uses less digits than its factorization.

61521421410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177923 (or 177920 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 61521421410 its reverse (1412412516), we get a palindrome (62933833926).

The spelling of 61521421410 in words is "sixty-one billion, five hundred twenty-one million, four hundred twenty-one thousand, four hundred ten".