21950061 has 8 divisors (see below), whose sum is σ = 33447744. Its totient is φ = 12542880.

The previous prime is 21950053. The next prime is 21950099. The reversal of 21950061 is 16005912.

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

It is not a de Polignac number, because 21950061 - 2³ = 21950053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21950011) 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, 522600 + ... + 522641.

It is an arithmetic number, because the mean of its divisors is an integer number (4180968).

Almost surely, 2^21950061 is an apocalyptic number.

21950061 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21950061 is a deficient number, since it is larger than the sum of its proper divisors (11497683).

21950061 is a wasteful number, since it uses less digits than its factorization.

21950061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045251.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 21950061 is about 4685.0892200683. The cubic root of 21950061 is about 279.9917557096.

Adding to 21950061 its reverse (16005912), we get a palindrome (37955973).

The spelling of 21950061 in words is "twenty-one million, nine hundred fifty thousand, sixty-one".