1921425501961 has 8 divisors (see below), whose sum is σ = 2202430929920. Its totient is φ = 1642049091648.

The previous prime is 1921425501949. The next prime is 1921425501979. The reversal of 1921425501961 is 1691055241291.

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

It is not a de Polignac number, because 1921425501961 - 2¹⁹ = 1921424977673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921425501911) 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, 407251881 + ... + 407256598.

It is an arithmetic number, because the mean of its divisors is an integer number (275303866240).

Almost surely, 2^{1921425501961} is an apocalyptic number.

It is an amenable number.

1921425501961 is a deficient number, since it is larger than the sum of its proper divisors (281005427959).

1921425501961 is an equidigital number, since it uses as much as digits as its factorization.

1921425501961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814508823.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 1921425501961 in words is "one trillion, nine hundred twenty-one billion, four hundred twenty-five million, five hundred one thousand, nine hundred sixty-one".