21940152 has 32 divisors (see below), whose sum is σ = 59070480. Its totient is φ = 6750720.

The previous prime is 21940151. The next prime is 21940159. The reversal of 21940152 is 25104912.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21940151) 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, 34849 + ... + 35472.

Almost surely, 2^21940152 is an apocalyptic number.

It is an amenable number.

21940152 is an abundant number, since it is smaller than the sum of its proper divisors (37130328).

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

21940152 is a wasteful number, since it uses less digits than its factorization.

21940152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70343 (or 70339 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21940152 is about 4684.0315968191. The cubic root of 21940152 is about 279.9496167849.

It can be divided in two parts, 219401 and 52, that added together give a triangular number (219453 = T₆₆₂).

The spelling of 21940152 in words is "twenty-one million, nine hundred forty thousand, one hundred fifty-two".