121505214154 has 16 divisors (see below), whose sum is σ = 190201799808. Its totient is φ = 58105162192.

The previous prime is 121505214151. The next prime is 121505214179. The reversal of 121505214154 is 451412505121.

It is not an unprimeable number, because it can be changed into a prime (121505214151) 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, 328344 + ... + 592300.

It is an arithmetic number, because the mean of its divisors is an integer number (11887612488).

Almost surely, 2^121505214154 is an apocalyptic number.

121505214154 is a deficient number, since it is larger than the sum of its proper divisors (68696585654).

121505214154 is a wasteful number, since it uses less digits than its factorization.

121505214154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273989.

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 121505214154 its reverse (451412505121), we get a palindrome (572917719275).

The spelling of 121505214154 in words is "one hundred twenty-one billion, five hundred five million, two hundred fourteen thousand, one hundred fifty-four".