21951456 has 48 divisors (see below), whose sum is σ = 57915648. Its totient is φ = 7280000.

The previous prime is 21951443. The next prime is 21951469. The reversal of 21951456 is 65415912.

It is an interprime number because it is at equal distance from previous prime (21951443) and next prime (21951469).

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

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, 23641 + ... + 24551.

It is an arithmetic number, because the mean of its divisors is an integer number (1206576).

Almost surely, 2^21951456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21951456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28957824).

21951456 is an abundant number, since it is smaller than the sum of its proper divisors (35964192).

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

21951456 is a wasteful number, since it uses less digits than its factorization.

21951456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1167 counting only the distinct ones).

The product of its digits is 10800, while the sum is 33.

The square root of 21951456 is about 4685.2380942701. The cubic root of 21951456 is about 279.9976870557.

The spelling of 21951456 in words is "twenty-one million, nine hundred fifty-one thousand, four hundred fifty-six".