1621201686041 has 8 divisors (see below), whose sum is σ = 1856092876224. Its totient is φ = 1387133233200.

The previous prime is 1621201685911. The next prime is 1621201686131. The reversal of 1621201686041 is 1406861021261.

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 1621201686041 - 2¹⁴ = 1621201669657 is a prime.

It is a super-2 number, since 2×1621201686041² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1621201685986 and 1621201686004.

It is not an unprimeable number, because it can be changed into a prime (1621201685041) 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, 205680110 + ... + 205687991.

It is an arithmetic number, because the mean of its divisors is an integer number (232011609528).

Almost surely, 2^{1621201686041} is an apocalyptic number.

It is an amenable number.

1621201686041 is a deficient number, since it is larger than the sum of its proper divisors (234891190183).

1621201686041 is an equidigital number, since it uses as much as digits as its factorization.

1621201686041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411368671.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 1621201686041 in words is "one trillion, six hundred twenty-one billion, two hundred one million, six hundred eighty-six thousand, forty-one".