61420521 has 32 divisors (see below), whose sum is σ = 90576000. Its totient is φ = 36868608.

The previous prime is 61420477. The next prime is 61420543. The reversal of 61420521 is 12502416.

It is not a de Polignac number, because 61420521 - 2²⁵ = 27866089 is a prime.

It is a super-2 number, since 2×61420521² = 7544960799822882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61420571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120415 + ... + 120923.

It is an arithmetic number, because the mean of its divisors is an integer number (2830500).

Almost surely, 2^61420521 is an apocalyptic number.

It is an amenable number.

61420521 is a deficient number, since it is larger than the sum of its proper divisors (29155479).

61420521 is a wasteful number, since it uses less digits than its factorization.

61420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 61420521 is about 7837.1245364611. The cubic root of 61420521 is about 394.5522266648.

Adding to 61420521 its reverse (12502416), we get a palindrome (73922937).

The spelling of 61420521 in words is "sixty-one million, four hundred twenty thousand, five hundred twenty-one".