21867900154 has 16 divisors (see below), whose sum is σ = 33871309056. Its totient is φ = 10577700000.

The previous prime is 21867900151. The next prime is 21867900161. The reversal of 21867900154 is 45100976812.

It is a self number, because there is not a number n which added to its sum of digits gives 21867900154.

It is not an unprimeable number, because it can be changed into a prime (21867900151) 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, 132654 + ... + 247654.

It is an arithmetic number, because the mean of its divisors is an integer number (2116956816).

Almost surely, 2^21867900154 is an apocalyptic number.

21867900154 is a deficient number, since it is larger than the sum of its proper divisors (12003408902).

21867900154 is a wasteful number, since it uses less digits than its factorization.

21867900154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118101.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 21867900154 in words is "twenty-one billion, eight hundred sixty-seven million, nine hundred thousand, one hundred fifty-four".