61012421015 has 48 divisors (see below), whose sum is σ = 91844856768. Its totient is φ = 37889399808.

The previous prime is 61012421009. The next prime is 61012421017. The reversal of 61012421015 is 51012421016.

It is not a de Polignac number, because 61012421015 - 2⁶ = 61012420951 is a prime.

It is a super-2 number, since 2×61012421015² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61012421017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1254227 + ... + 1301963.

It is an arithmetic number, because the mean of its divisors is an integer number (1913434516).

Almost surely, 2^61012421015 is an apocalyptic number.

61012421015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61012421015 is a deficient number, since it is larger than the sum of its proper divisors (30832435753).

61012421015 is a wasteful number, since it uses less digits than its factorization.

61012421015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47868 (or 47815 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

Subtracting from 61012421015 its reverse (51012421016), we obtain a palindrome (9999999999).

The spelling of 61012421015 in words is "sixty-one billion, twelve million, four hundred twenty-one thousand, fifteen".