121620653 has 32 divisors (see below), whose sum is σ = 162432000. Its totient is φ = 88197120.

The previous prime is 121620643. The next prime is 121620673. The reversal of 121620653 is 356026121.

It is not a de Polignac number, because 121620653 - 2¹⁴ = 121604269 is a prime.

It is a super-2 number, since 2×121620653² = 29583166472292818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121620643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85613 + ... + 87021.

It is an arithmetic number, because the mean of its divisors is an integer number (5076000).

Almost surely, 2^121620653 is an apocalyptic number.

It is an amenable number.

121620653 is a deficient number, since it is larger than the sum of its proper divisors (40811347).

121620653 is a wasteful number, since it uses less digits than its factorization.

121620653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 121620653 is about 11028.1754157249. The cubic root of 121620653 is about 495.4529785404.

Adding to 121620653 its reverse (356026121), we get a palindrome (477646774).

The spelling of 121620653 in words is "one hundred twenty-one million, six hundred twenty thousand, six hundred fifty-three".