61420021 has 8 divisors (see below), whose sum is σ = 68278784. Its totient is φ = 54866160.

The previous prime is 61420013. The next prime is 61420043. The reversal of 61420021 is 12002416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61420021 - 2³ = 61420013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61419977 and 61420004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61420001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75801 + ... + 76606.

It is an arithmetic number, because the mean of its divisors is an integer number (8534848).

Almost surely, 2^61420021 is an apocalyptic number.

It is an amenable number.

61420021 is a deficient number, since it is larger than the sum of its proper divisors (6858763).

61420021 is a wasteful number, since it uses less digits than its factorization.

61420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152451.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 61420021 is about 7837.0926369413. The cubic root of 61420021 is about 394.5511560311.

Adding to 61420021 its reverse (12002416), we get a palindrome (73422437).

The spelling of 61420021 in words is "sixty-one million, four hundred twenty thousand, twenty-one".