61356021 has 4 divisors (see below), whose sum is σ = 81808032. Its totient is φ = 40904012.

The previous prime is 61356017. The next prime is 61356041. The reversal of 61356021 is 12065316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61356021 - 2² = 61356017 is a prime.

It is a super-2 number, since 2×61356021² = 7529122625904882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61355982 and 61356000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61356011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10226001 + ... + 10226006.

It is an arithmetic number, because the mean of its divisors is an integer number (20452008).

Almost surely, 2^61356021 is an apocalyptic number.

It is an amenable number.

61356021 is a deficient number, since it is larger than the sum of its proper divisors (20452011).

61356021 is a wasteful number, since it uses less digits than its factorization.

61356021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20452010.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 61356021 is about 7833.0084258859. The cubic root of 61356021 is about 394.4140669120.

The spelling of 61356021 in words is "sixty-one million, three hundred fifty-six thousand, twenty-one".