21954053 has 8 divisors (see below), whose sum is σ = 23985120. Its totient is φ = 19928880.

The previous prime is 21954047. The next prime is 21954059. The reversal of 21954053 is 35045912.

It is an interprime number because it is at equal distance from previous prime (21954047) and next prime (21954059).

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

It is a cyclic number.

It is not a de Polignac number, because 21954053 - 2⁶ = 21953989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954059) 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, 10826 + ... + 12692.

It is an arithmetic number, because the mean of its divisors is an integer number (2998140).

Almost surely, 2^21954053 is an apocalyptic number.

It is an amenable number.

21954053 is a deficient number, since it is larger than the sum of its proper divisors (2031067).

21954053 is a wasteful number, since it uses less digits than its factorization.

21954053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 21954053 is about 4685.5152331414. The cubic root of 21954053 is about 280.0087284694.

Adding to 21954053 its reverse (35045912), we get a palindrome (56999965).

The spelling of 21954053 in words is "twenty-one million, nine hundred fifty-four thousand, fifty-three".