121973621 has 16 divisors (see below), whose sum is σ = 152316288. Its totient is φ = 94891200.

The previous prime is 121973609. The next prime is 121973633. The reversal of 121973621 is 126379121.

It is an interprime number because it is at equal distance from previous prime (121973609) and next prime (121973633).

It is a cyclic number.

It is not a de Polignac number, because 121973621 - 2⁶ = 121973557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121973021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80951 + ... + 82443.

It is an arithmetic number, because the mean of its divisors is an integer number (9519768).

Almost surely, 2^121973621 is an apocalyptic number.

121973621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121973621 is a deficient number, since it is larger than the sum of its proper divisors (30342667).

121973621 is a wasteful number, since it uses less digits than its factorization.

121973621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572.

The product of its digits is 4536, while the sum is 32.

The square root of 121973621 is about 11044.1668314092. The cubic root of 121973621 is about 495.9318175550.

The spelling of 121973621 in words is "one hundred twenty-one million, nine hundred seventy-three thousand, six hundred twenty-one".