151221216 has 48 divisors (see below), whose sum is σ = 397767888. Its totient is φ = 50304000.

The previous prime is 151221197. The next prime is 151221223. The reversal of 151221216 is 612122151.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 151221192 and 151221201.

It is a congruent number.

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, 56386 + ... + 59006.

It is an arithmetic number, because the mean of its divisors is an integer number (8286831).

Almost surely, 2^151221216 is an apocalyptic number.

151221216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

151221216 is an abundant number, since it is smaller than the sum of its proper divisors (246546672).

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

151221216 is a wasteful number, since it uses less digits than its factorization.

151221216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235 (or 3227 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 151221216 is about 12297.2035845553. The cubic root of 151221216 is about 532.7673175671.

Adding to 151221216 its reverse (612122151), we get a palindrome (763343367).

The spelling of 151221216 in words is "one hundred fifty-one million, two hundred twenty-one thousand, two hundred sixteen".