21145012154 has 8 divisors (see below), whose sum is σ = 36248592288. Its totient is φ = 9062148060.

The previous prime is 21145012153. The next prime is 21145012159. The reversal of 21145012154 is 45121054112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21145012154² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21145012153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755178992 + ... + 755179019.

It is an arithmetic number, because the mean of its divisors is an integer number (4531074036).

Almost surely, 2^21145012154 is an apocalyptic number.

21145012154 is a deficient number, since it is larger than the sum of its proper divisors (15103580134).

21145012154 is a wasteful number, since it uses less digits than its factorization.

21145012154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510358020.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 21145012154 its reverse (45121054112), we get a palindrome (66266066266).

The spelling of 21145012154 in words is "twenty-one billion, one hundred forty-five million, twelve thousand, one hundred fifty-four".