61221036276 has 192 divisors, whose sum is σ = 180246124800. Its totient is φ = 17851871232.

The previous prime is 61221036271. The next prime is 61221036313. The reversal of 61221036276 is 67263012216.

61221036276 is a `hidden beast` number, since 6 + 1 + 2 + 21 + 0 + 3 + 627 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 61221036276.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221036271) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1832296 + ... + 1865408.

It is an arithmetic number, because the mean of its divisors is an integer number (938781900).

Almost surely, 2^61221036276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61221036276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90123062400).

61221036276 is an abundant number, since it is smaller than the sum of its proper divisors (119025088524).

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

61221036276 is a wasteful number, since it uses less digits than its factorization.

61221036276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33215 (or 33207 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 61221036276 in words is "sixty-one billion, two hundred twenty-one million, thirty-six thousand, two hundred seventy-six".