121555211602 has 16 divisors (see below), whose sum is σ = 199338152832. Its totient is φ = 55133028720.

The previous prime is 121555211599. The next prime is 121555211621. The reversal of 121555211602 is 206112555121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5956593 + ... + 5976964.

It is an arithmetic number, because the mean of its divisors is an integer number (12458634552).

Almost surely, 2^121555211602 is an apocalyptic number.

121555211602 is a deficient number, since it is larger than the sum of its proper divisors (77782941230).

121555211602 is a wasteful number, since it uses less digits than its factorization.

121555211602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11934033.

The product of its (nonzero) digits is 6000, while the sum is 31.

Adding to 121555211602 its reverse (206112555121), we get a palindrome (327667766723).

The spelling of 121555211602 in words is "one hundred twenty-one billion, five hundred fifty-five million, two hundred eleven thousand, six hundred two".