61221700 has 18 divisors (see below), whose sum is σ = 132851306. Its totient is φ = 24488640.

The previous prime is 61221649. The next prime is 61221701. The reversal of 61221700 is 712216.

It can be written as a sum of positive squares in 3 ways, for example, as 6724 + 61214976 = 82^2 + 7824^2 .

It is not an unprimeable number, because it can be changed into a prime (61221701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 306009 + ... + 306208.

Almost surely, 2^61221700 is an apocalyptic number.

It is an amenable number.

61221700 is an abundant number, since it is smaller than the sum of its proper divisors (71629606).

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

61221700 is a wasteful number, since it uses less digits than its factorization.

61221700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612231 (or 612224 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 61221700 is about 7824.4296916772. The cubic root of 61221700 is about 394.1260386788.

Adding to 61221700 its reverse (712216), we get a palindrome (61933916).

The spelling of 61221700 in words is "sixty-one million, two hundred twenty-one thousand, seven hundred".