121012442154 has 16 divisors (see below), whose sum is σ = 268916538240. Its totient is φ = 40337480700.

The previous prime is 121012442153. The next prime is 121012442171. The reversal of 121012442154 is 451244210121.

121012442154 is a `hidden beast` number, since 1 + 210 + 1 + 2 + 442 + 1 + 5 + 4 = 666.

It is a super-2 number, since 2×121012442154² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121012442153) 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, 1120485522 + ... + 1120485629.

It is an arithmetic number, because the mean of its divisors is an integer number (16807283640).

Almost surely, 2^121012442154 is an apocalyptic number.

121012442154 is an abundant number, since it is smaller than the sum of its proper divisors (147904096086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121012442154 is a wasteful number, since it uses less digits than its factorization.

121012442154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240971162 (or 2240971156 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 121012442154 its reverse (451244210121), we get a palindrome (572256652275).

The spelling of 121012442154 in words is "one hundred twenty-one billion, twelve million, four hundred forty-two thousand, one hundred fifty-four".