61221051 has 24 divisors (see below), whose sum is σ = 91476944. Its totient is φ = 39424320.

The previous prime is 61221047. The next prime is 61221073. The reversal of 61221051 is 15012216.

61221051 is a `hidden beast` number, since 612 + 2 + 1 + 0 + 51 = 666.

It is not a de Polignac number, because 61221051 - 2² = 61221047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61221011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51696 + ... + 52866.

Almost surely, 2^61221051 is an apocalyptic number.

61221051 is a deficient number, since it is larger than the sum of its proper divisors (30255893).

61221051 is a wasteful number, since it uses less digits than its factorization.

61221051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 61221051 is about 7824.3882188961. The cubic root of 61221051 is about 394.1246459880.

Adding to 61221051 its reverse (15012216), we get a palindrome (76233267).

The spelling of 61221051 in words is "sixty-one million, two hundred twenty-one thousand, fifty-one".